Other than wearing a harness the best advice I can give you is to get your buddy or girlfriend to go with you, put on your hunting clothes, even face mask and actually climb a tree and shoot your broadheads at a target...

Have them pull the arrows out, put in your quiver and using a rope pull back up to you and try again...I use Thunderheads and either use old heads or blades already shot into a deer...You only need 2-3 practice arrows by this time of year...

This way you have worked on your form and know that all your equipment is properly tuned...

Now, I'll confess....
One evening years ago, even before the internet I missed a doe 3 times!!! I shot over her all 3 times...

The next day, I went back to that tree with a buddy, climbed to the same height and drilled the target all three times...I then put my facemask on and shot over it...My facemask was keeping me from finding my anchor...I quit using a facemask or use a half mask and pull it down when it's time to shoot...

I've heard similiar stories of guys shooting off a 2nd story, form great until they are in the tree then they want to keep their back tight to the tree so they don't bend at the waist...A good harness will fix this...