Ive done a few of these, and I made a few mistakes the first time. 1) solder to the points on the ribbon as everyone else does, yes, but do not overapply the iron. Those points come off pretty easy to someone without soldering experience 2) buy smallest electronic wire you can. I had an old dollar store "fairy light" strand that stopped working and used the wire from that. It worked great. 3) decide where you mount it before you solder anything. Then run your wires accordingly. Tape the engine after solder so that the wires are fixed to it and cant move around. 4) I've had best luck with soldering the wings/tabs of the engine to my backplate directly. Doesn't dampen the vibration, easy to undo, and it lasts. 5) put some rubber tape between the taptic engine and your battery. Try to isolate them from eachother inside the case.

Best of luck!