Please note - the following is all based on personal thoughts and experience. Please ask a qualified orthodox Rabbi if you have any halachic concerns about following these methods.
Fight pleasure with pleasure. Indecent images may well prevent a person from really enjoying life. What is truly the greatest pleasure in the world? I would guess that it is bonding with the Almighty blessed be He in this world. If you want a truly wonderful and sublime experience of genuine connection with Hashem learn to daven the Amidah by heart with your eyes closed and your ears safely blocked with earplugs (until you are required to answer amen etc. If you daven long enough you usually won't be required to answer). Then the amidah becomes an entrancing experience. All that exists is the words of the amidah, your thoughts, you and Hashem. With this method the greater the kavanah the greater the pleasure and time flows by totally unnoticed. How can one not love the amidah after an experience such as this?!! In this state you can make the words of prayer a silent or whispered (according to the authority you follow) "song on your lips" as the Sefer Chasidim z'l lovingly prescribes. Of course, the purer one's mind, the greater the kavanah, and the greater the pleasure, giving rich incentive to give up that which prevents higher far more sublime levels of pleasure.
I would guess however, that all this probably just a faint impression of the beauty and joy in entirely bonding with the Almighty. If that is the joy that comes from being bound to Hashem in prayer, what is the pleasure that comes with being bound to still greater mitzvot and what is the pleasure of the greatest mitzvah of all - profoundly deep all encompassing study of the Holy Torah?!! By this I do not necessarily at all mean kabbalah. Kabbalah it seems is only really a profound pleasure if someone has mastered the levels of Torah before it. But 'even' in humash there is tremendous depth. Savor the words and wisdom of a pasuk. Find different commentaries people don't learn so much with striking beautiful insights. Taste a Rashi z'l. Really taste it, and enjoy it like a beautiful unique signature dish from a master chef. Know as you do, you are bonding with the Almighty and let that meditation increase your pleasure. Or a Mishna. Or a Gemara. Again try to memorize, to set the words on your heart; try to bond with the words with your eyes closed and your ears safely sealed. There is no pleasure like it at all for it is a pleasure of connecting with Hashem, connecting with the unconnectable, doing what is impossible yet especially for us amazingly enchantingly made possible for us by the Almighty, Lord of all the universe.
On top of this study helps tefila and tefila helps study - raising the pleasure to still higher levels of existence. But where to start? I suggest that one try starting with tefila as it is a relatively easy way to start.
A method for memorization of the Amidah
- If you are used to English, use an English-Hebrew siddur
- Learn in depth commentaries of the Amida - it will enormously enhance your appreciation of the importance of the Amidah and greatly add to your enjoyment of savoring the words
- Learn to say the Hebrew well
- Learn to say the Hebrew while only reading the English
- Work out a memorization key that enables you to logically link one paragraph with the next e.g. judgment is logically followed by the wicked and the righteous and the righteous logically want to live in Jerusalem.
- Optional: Practice saying a paragraph when you are not davening - without mentioning the shem and malchut (unless an orthodox and pious talmid chacham says you can) - say a little, repeat a little with your eyes closed, continue a little, then try to review a chunk with your eyes closed.
- Don't rush it at all. Rushing this is a mistake - it may take years months or weeks to do this properly. It took me years with on and off effort. But know it is worth it - you will benefit for the rest of your life. So feel good about using a siddur if for the time being you concentrate better with it.
- Ask Hashem to help you
- Be respectful of others in the minyan. If you want to daven for a long time daven amidah standing in front of a wall (at the front of the shul if need be if the Rabbi and the seat allocator do not mind) - this way you will not prevent from moving those who observe the halacha of not moving towards one who is davening (ask a Rabbi for details). Hashem loves those who respect others and surely helps them more for this.
- When you trust your memory as you have tested yourself, go for it. First do little groups of blessings checking you have it right, then when you are really sure you can 'swim underwater all the way". When you have reached this point, congratulations - you have made a major achievement in your davening.
- Above all, respect the needs of the minyan. If a minyan needs you to answer blessings or similarly if your wife, children or work need you, this is definitely not the time to daven a long amidah. Daven a good amidah, daven also to be given the chance to daven long, help out, and Hashem will surely help you.