Handscrambling a square-1 is perfectly possible, that's what I'm doing most of the time. No particular methods, just some tips:
- pay more attention at breaking your usual routines, and in particular at not always doing the same first 4 or 5 moves;
- do a bit more moves than needed (not hundreds, that would be silly, but something like 25-30 twists should be enough).
And yes, it's hard at the beginning, but it becomes easier with practice.