Just tiny little strokes with razor, I go against the hair all the time and just take time and do small strokes around knee and never have any issues really.
Shaving your legs at work..... Even I wouldn't do that!! hahahah
For those that don't know you should take great care around the patella as the skin is quite thin. It's easy enough to be a bit oblivious because after all our knees are hard right?
You can hack up the rest