Tree Frog

I am so tired of being a gym rat and not having any rock around. I had to do something about it... So I found a solid tree in the woods next to my house and landed a rope in a high branch. I connected some other rope to the main line using Blake hitches.. Then I inch wormed up, however, I came across one issue. When I was at the top I hooked into slings that I threw over the branch. Then I untied the the Blake hitches, pulled the one side of the rope back to the ground, and hooked into my repel device. There were not any branches beneath me, so I was unable to push or pull myself up to create enough slack to unclip from my sling. I did not know what to do. I just sat in the tree for 15 minuets trying to one arm pull up myself just enough slack to lock off my belay device and unclip from the slings. It took some serious grunting, but funnily freed myself and repelled down. I need to come up with some thing make sure this does not happen again. Any ideas?