I would stay away for metric blues. I never knew they're just a random fastener guys have used with some success, though ive seen the downside of using them (stripped block threads
I'm pretty sure with a new stock HG, ARP studs and a GREAT tune you can boost up to 20psi no problems as long as the motor is somewhat in good mechanically good shape and you surround yourself with good turbo components (Standalone, properly sized turbo, exhaust, intercooler, clutch etc)
As for doing WORK, PM FuryriderX. He's done an entire turbo build in his driveway and im sure he could tell you what you would need to be able to do to get it done on your own.