There is always something valuable below where you are cutting. Your legs and feet at the least.
All it takes is one time of getting hurt, which is easier if under some external pressure. A new guy on one of the 'other forums' got in over his head and put a tree on the power lines.
Being an Electrical Engineer shows that you're good at Electrical Engineering, or at least well enough to be successful, presumably, right?
You can be very intelligent about some stuff but not others. There are multiple ways of being intelligent; according to Gardner, there are six. Being able to use a semicolon doesn't mean I'm adept at analyzing shifting, 3d, geometric puzzles with various densities throughout the puzzle.
I'd suggest you start with learning all the terminology appropriate to the techniques you need, in order to not get into an "Ohhhh,...I figured" situation.
Are you familiar with tension wood, compression wood, top/bottom/end/side binds, kerfs, rakers, cutters, gunning sights, reaming, boring, head leaner, branch collar, targeted pruning cut, pruning dose, included-bark crotch, excluded-bark crotch, branch bark ridge, hung tree, walking it down, in the bight, line-angles, vector forces, stump shot, holding wood, dutchman? Dialed in on them?
People will gladly point you toward resources and good knowlege.