If you are comfortable with the fact that it voids your warranty, I have done MANY. I just have to say that to be fair to you. It is really rather simple. I have taken them apart, done blade swaps, cleaned, lubed, etc.
The main thing is ho have a good set of Torx bits. The smaller ones in the handle are T6 I believe. The pivot is a T8 or T10. I'm not home, so I'm going off memory here.
Make sure your bits fit right and disassemble. I take and put right side parts in a right hand pile, left side parts in a left side pile. Really easy to disassemble.
Reassembly isn't tough. I take my blade all the way to snug. So it will barely open/close. Then back off very, very slowly. You will eventually f'ing that "sweet spot" of good pivot, and smoothness. With the Millie, the Torx that holds the blade stop pin in, also has a bearing on pivot. Don't overly torque on the blade stop pin Torx. If you do, the blade pivot will be mother difficult to dial in.
Good luck, and be patient. It's not that tough once you do one.