Run your wires and use bread loaf twisties or a insulated solid #16 gauge wire to temporarily hold your wires until you are ready for final tie with tie wraps. Saves you accidently damaging any wires trying to cut off tie wraps in the process. If you don't have a good crimp tool then go buy one and throw away that POS multi tool you have which will only cause you trouble later with bad connections. As for as the comment about using crimp connectors there is absolutely nothing wrong with using crimp connectors if you have the proper tools to do them with. I would not solder my connections as the heat will weaken the wire strands. Each to his own. I will say do not use cheap connectors on your car from home depot or local hardware store. Go to electrical supply house and ask for T&B or Panduit connectors along with some heatshrink tube for each connection. Take your time and watch for any edges that may chaffe your wire. Leave a few inches of slack for each connection with no undue stress applied on the connection. Remember every extra connection is only a place for something to wrong so avoid unnecessary splices and such. Good luck.