I would suggest this:

Climb safely to your desired hunting height
Range several trees by pointing the range finder at the tree at your level
This will give you the horizontal distance to these trees which become landmarks for range estimation
Unless you hunt really high, your best bet is to keep good form, bend at the waist and shoot the range finder distance. It's just not that BIG of a factor for an average deer hunter at medium heights fromreasonably level ground shooting a modern compound

Bottom line: Find a place where you can climb a tree and shoot your bow without scenting up your stand sites. It will releive your anxiety.