I just did this last month. The installer had to cut off the RJ45 connector to run the cable down the mast
. When he reinstalled the connector, he got it wrong. So, I went to home depot, bought a crimper (a good one) and watched a few youtube videos. It still took me about a half hour to get it right. There are 8 strands of different colors that have to be threaded simultaneously through the holes in the connector in the correct order...easier said than done. There are also different crimpers for different types of connectors, so make sure you get the right one. Youtube is your friend.