Do it yourself mate. You have the skills and you will find it very rewarding. The only thing you need to know as far as bike specific engineering is the left pedal and right bottom bracket are left hand thread. Apart from that and not forgetting to lock cone nuts together it's just unbolt, clean, grease, put back, set up. Ride, enjoy, buy another bike and another then run out of room. Then buy another for a crank you like for another project and have no idea what to do with the rest and repeat. Good luck.