Walking them up is not so much the problem, but crawling up and strapping it to the tree without help can be a real adventure.        

Brad Arnett and Fletcher have outlined the most efficient and acceptably safe way if you are by yourself.

Crossing ropes used with mid support bar works just fine.

I'm not that strong, but a 15 footer isn't that tough.

I've done 20s alone and this is a real chore.

Use common sense to pick a good tree first if possible.

I just made sure one of my children was a boy so I would have help to do the heavy lifting. But, a rope over a limb is usually enough to get it up when the son is not around.

I have found that if I take a section out of my 16 ft ladder and turn it into a 10 to 12 footer it goes up without a hitch. 16 foot is just to awkward for one person. I always anchor at the top and in the middle with ratchet straps. Anchor the middle first and then anchor the top. I realize that there are some advantages to the taller ladders but, where I hunt, the 10 to 12 footers work just fine.  

After listening to my dad cuss about wrassling ladder stands around, I think there should be a disclaimer on every ladder stand box that says, "Tractor and bucket not included".

Darren