[cncool]

Benching without spotting is easy if you aren't going to one rep maxes. If you are doing sets of 5, then don't do rep N if rep N-1 was too hard that you think you will fail the rep. Also, if you stop before the 5th rep, you should be doing sets at a lighter weight.

[ErikAugust]

I would always suggest at least doing one set to failure. It's not hard to find someone to spot for 10 seconds.