1. it is easy.
2. there is an alignment mark
On the needlebar shaft, there is a groove put in about 1/2 to 1 inch from the top.
Turn the handwheel until that mark is just barely visible.
Set the needle in so that the eye is right even with the top surface of the needleplate
(i center the hole on the plane of the top, if that make sense)
make sure the long groove is facing towards the shuttle.
tighten the set screw
Ta Da.