I leveled my truck using the RC kit. It will definitely be easier doing the job with 2 people. The actual spacer install under the front strut is simple enough after you have disassembled everything. The 2nd person helps when it comes time to compress the strut, that now has the new spacer under it, so you can catch the nuts on the bolts that secure he strut to the lower control arm. I tried using a jack to lift the lower arm, but it raised the hole truck. Instead I had a friend push down on the upper arm, compressing the strut enough so I could catch the nuts.
I used the video shown on the RC website. Haven't been to the site in a while, but it was there at the time I did my truck (about a year ago).