@Mr_NutterButter
Depends on your will.
But, most people will tell you, that you should go only 70% there, but repeat a few times, especially do the last repetition till failure.

Also, FOR THE LOVE OF GOD, do NOT get hurt ego lifting. You're holding 10s of kg on a muscule, that you're trying to fail. So, Don get surprised, when they do fail, and be ready to make that fail safe.