Order a few extra connectors so you can do a couple of practice crimps on scrap wire. There's a little bit of a knack to it, but once you get the hang of the crimp tool it's impossible to tell the difference between your crimp and the original factory crimp. These connections are so tight that i don't even twist the copper strands for an even better OEM look, and I believe the un-twisted connection has better surface area contact due to the rolled action of the crimp process and the way it gathers the strands inside the connection. The tail of the connector is even designed to put the crimp on the insulating jacket too. I was hesitant to spend the money on a connection system that I had no personal experience with, but the results completely erased all doubt. I am working my way through my harness to eliminate the cumulative resistance of the 33 year-old connections that have started to cause the periodic, gradual meltdown of my 15A main fuse. So far, so good.