Rolling my r's is something I could never do. Now I'm learning Russian, I feel I really need to. At first I had a very week sort of rolling sound. Now I can sort of roll the sound, but it takes a little work to do it and I have trouble rolling it if its at the end of the word. Sometimes when I roll it, it sounds weak. Other times I accidentally roll it really well and it sounds great, but then I don't know how I did it and I'm back to awkwardly trying to force it.

I think I'll get there soon. I also just say "др" to try and roll it. Works after a while.