I've got this massive oak in my back yard that could hit house/pool, neighbor's shead/woodpile, or generally destroy her trees...I've cut a lot of large limbs off it already, but now, when I go up into it via ladder, even with climbing gear properly attached, I get very nervous. (cliffs don't break in funny ways, so rock climbing doesn't scare me) I'm thinking of having a pro just get it on the ground. What's a fair price for that?