I'm not an arborist by any means, but have been doing tree work (basic felling, pruning, firewood processing, etc) most of my life. But I'm getting older and trying to be smarter. I have some large trees (50-100' oak and pecan trees) that are dead standing that I need to take down, and instead of just hoping for the best, I'm thinking about buying the right equipment to put them down in the right spot and minimizing damage to other trees, etc. If I just want to guide the fall of a 100' oak tree, what block / tackle combinations should I put together, and what's the best source for the tools? Amazon is nice, but I don't trust their offerings to be the best choices generally speaking.