Easy stuff- I've made a couple.
You just have to make sure the bridge is exactly 24 & 3/4 or 25 1/2 from the nut,
otherwise it will not be tuneable. If you get a 24 & 3/4 scale neck, make sure
you get a body with the holes predrilled for 24 & 3/4 scale bridge, not 25 1/2.
Also, the only real tricky part is filing the slots in the nut, but Stewmac used to sell
a pre slotted nut. Even if they don't- nuts are cheap, and you can screw up 1 or 2
and not be out much dough at all.
You have to have a basic knowledge of electronics. If you fiddle with guns and can
figure it out, then following a schematic with a cheap soldering iron is easy.
I've gotten some REALLY nice bodies and necks from Warmoth. Stewmac bodies
and necks have crappier finishes on them, they just buy the bodies as parts from
a huge factory in China I imagine, whereas Warmoth is a bunch of hippy woodworkers
who really put heart and sweat into deep glossy finishes, and excellent necks.