When your wrapping and pulling the wrap tight. Pull up and not down when getting your tight wrap. That will relieve any pain on the Knee cap caused from a tight wrap.
Also keep your legs straight and toes pulled back during the whole wrap process.
I Go tight as I can below the knee, Then slack a tiny bit when going over the knee cap.. Then right back to tight as possible above the knee.
ALWAYS Wrap In to out... So your left knee will wrap Counter Clock wise and your right knee will wrap Clock wise.
These have been the best tips I have gotten on wrapping.