Robbing a bank to me is "easy" if you plan it and do it right... what's hard is getting the nerve to do it.
If you would rob a bank though, why not rob somewhere that has way more untraceable money like a Jewelry store or currency exchange? Those places likely won't have any security and you wont get the added time of bank robbery.
You could scope one of those places out and catch the owner as he is loading the cash or jewelry. He's gonna have a bag going in and out of the store eventually.
you'd have to have a clean record number 1, a stolen car 2, then burning or bleaching the stolen car, plus you'd have to hope and pray that dye aint exploding once you open the bag, plus if the bills are traceable you are screwed, plus security cameras, plus a idiot may play hero and you'll be forced to shoot, plus if the bank is full you;ll be waiting in line for example and everyone will be looking at you for a mintue for a easy description.
plus you couldn't use your cellphone for a minute, i remember a case where cops pinned 4 black dudes by the cell towers and text msgs
there is way more easier ways to get money