If your are handy with tools and wood working, and have the proper tools, you can do it yourself.
That being said, I would send the body to Lakland and have them mount the neck.
Why?
When pleking, if there is even a 1mm difference in the depth of your neck cavity route vs the routed jig that they use for pleking, the nut slots can be too high and cause action that just doesn't feel right or too low and cause fret out.
I bought a neck from them and the latter happened to me, the nut was cut too shallow and it caused fretout. Luckily, I do ok with wood and fixing guitars, I used baking soda and epoxy to add a small layer of material the the culprit slot.
Don't try to be a hero unless you are absolutely sure you can do it...then reconsider again.
That being said, I would send the body to Lakland and have them mount the neck.
Why?
When pleking, if there is even a 1mm difference in the depth of your neck cavity route vs the routed jig that they use for pleking, the nut slots can be too high and cause action that just doesn't feel right or too low and cause fret out.
I bought a neck from them and the latter happened to me, the nut was cut too shallow and it caused fretout. Luckily, I do ok with wood and fixing guitars, I used baking soda and epoxy to add a small layer of material the the culprit slot.
Don't try to be a hero unless you are absolutely sure you can do it...then reconsider again.

