How to paint Eldar Wraithguard Ulthwe? part 1/2

do you have any tricks when pinning one part of a model to another? like when you pinned the arms and the sword hands to the wrists? I have a hard time getting pins lined up thanks

Add a small dot of paint onto the wrist before you pin, attach and the hand and take off. Now you should have a dot on both the wrist and hand to act as a guide to drill.