First, whoever removes the bees needs to find out 'who owns the property' that the tree is located on. The owner has the final say on what happens to the tree and the bees. Just because someone that lives in the house on the property tells you that they want the bees gone/removed, and that they live there....so it is their tree.....you need to find out for sure who owns the tree, as I have seen some pretty bad legal things happen after a tree was cut.
Secondly, find out if the tree is to be saved, or if it can be safely cut down; check the location of the power lines, etc. before any tree is cut. If you cut the tree and it falls on anything valuable, you will be the one paying for it. Also, keep bystanders, kids and pets away from the removal area. Also, make sure that it is understood before the tree or any limbs ar cut, as to who is responsible for the removal of cut tree and brush; you do not want to get stuck with the cost of taking the tree to a waste site....it happens.
I do not mean to sound like a Philly lawyer, but you do learn things from experience....you need to cover your own behind when doing removals of any sort. Better safe than sorry.
Another thing to ponder before doing a cut out, is finding out if there might be some nails, staples or wire that has been attched to the tree and the tree has grown bark over the metal. A lot of folks like to use nails, staples, chains, etc. in the trees to either repair them, or to attach other things. It is not good to hit any metal in a tree with your chainsaw. It can turn a tiny piece of metal into a bullet with deadly results.
I seen a lot of freak accidents this year invovling bees and trees...not to mention the public who gets in the way.