Miller...
If you've never done it.....it's a "must" (like someone above stated). You'll find that your POI (Point of Impact) shouldn't change.....but the BIGGER issue is your comfort level at standing on that platform and drawing and shooting your bow (at least it was, for me). It takes a while to get comfortable at drawing while standing in different positions.
Get up a tree in the yard or nearby woods and go through the motions. You'll be glad you did.
As Predator says......
Remember to bend at the waist.
Again...more great advice. Good luck!