I just got around to doing the conversion this weekend. I highly recommend conversion to vacuum, and you cannot beat the convenience of RedRegal-T's "Kit" with all parts needed less the vacuum hose, for about $110. I also recommend an aftermarket vacuum block with the vacuum brake tap. The procedure to perform the conversion is listed on gnttype.org... Take a look and decide for yourself if you believe it is within your expertise. If you feel it is beyond your capabilities (I doubt it) find a place that is willing to install customer-supplied parts, but will at least guarantee the labor.
I could only get a MAX lifespan of 2 years on the PowerMaster before the pump failed or started leaking, or just started to blow fuses. That included an accumulator replacement to extend this last unit's life. (I've replaced with GM built units 3 times in 6 years!) The parts needed to keep these brake units running have exceeded my budget, and their lack of reliability has exceeded my patience! Others on this board swear up and down the PowerMaster is reliable... I have found this to be untrue in my case(s)!
Hardest part was the pedal arm swap. Getting the upper pivot bolt back through the brake pedal arm bushing. My trick for this was to position a small inspection mirror on the left side so I could see the hole (Nut side), and use a 12" extension and a spring loaded u-joint & socket to get the bolt over the steering column on the other. Once I could see when the pedal arm bushing was in position, I just pushed the bolt home.
An air/pneumatic 3/8" ratchet made my life much easier, although I could have done the job without it. I remember when I was 18... I didn't have the money for the repair or the tools! Guess what? At 35, I now have enough money for fancy tools, but I STILL don't have enough money to pay outrageous repair bills!
Whatever you decide to do, just do it yourself. The experience you gain will pay off your whole life.