This mod is easy to follow and do. also if you don't have helping hands I used a pair of pliers with a hair tie around it to hold the mosfet while I soldered to it and you can solder the 18 gauge to the mosfet by putting the wire through the holes in the terminals.
I recently completed the Cat-3 mod for the Hurricane, and had... an experience.
Helping Hands are definitely necessary. If you follow Luke's video guide, you should be alright for the most part.
The issue that I ran into is that the kit only includes 18 Gauge wire, and the MOSFET has two contacts that are far too small for that. The two contacts are intended for the JST connector that is shown in the video, and unless you have smaller wire, it's going to be very difficult to solder onto those contacts. At the time of my purchase there was not an option that I saw to add the JST connector to the kit. It's such a small part but it means a world of difference in terms of ease of completion.