I did the work myself (except the welding) with the Calmini Kit. That is the easiest route but there are people out there doing beefier three links by modding other kits.
It took me 6 months to complete the project but most of that time was waiting for the kit and finding the donor axle. I also swapped my rear axle as part of this project and had to find that donor axle. I also had to coordinate schedules with getting time at The Shop to work on it.
My passenger A arm was broken and my rig was not drive able when I did all this. If you order the kit and have all the parts on hand BEFORE you start the job, it won't take anywhere near that long. There is some cutting, grinding, and welding that needs to be done.