Hey Jason!
Don’t fear the kana! When you get going it’s really not bad at all! The R sound is definitely a bit of a pain. I’ve got some musical training so I’m used to practising until things start to hurt, and I always recommend that approach to anyone. Practise the sound until your tongue hurts! It’s also not a bad idea because Japanese just generally requires more tongue movement than English does, so you’ll have to build up some strength there anyways :D
Hope you have a good time! If you get stuck on anything, give us a shout. There are answers to be found here!
I haz a blog http://maninjapanchannel.wordpress.com/
https://www.youtube.com/watch?v=qLQzB-1u-dg