These two partner assisted pull-ups are a great option to ensure full-range of motion and individually based assistance.
Most lifters struggle with finishing the movement by getting their chin over the bar. Although many use bands for assistance, a band won't help you where you need help the most: at the top. Also, partner assisted pull-ups allows the person that's assisting to dictate how much help is needed.
Successful overhead pressers lift with violence and hate. Here's all the technique cues you need to add to that aggression, plus a complete overhead press program.