Always reset your focus ring to infinity (or min. distance) so you'll always turn it one direction. Also don't line up the patch, just turn until you see the contrast increase slightly (it's noticeable once you've trained your eye to see it). I find it a lot easier to focus with an RF patch than a ground glass since that contrast jump feels a lot more objective rather than judging whether the subject looks sharp enough.
Also if you think about it, Leicas are quite cheap as if you end up hating it you can sell them on for pretty much the same price. The problem is they're so compelling to shoot with, haha.
Menthel: I'm really jealous, been toying with the idea of buying a 35 'cron myself, but my Hexar does the whole 35 thing wonderfully.