I'm installing a new R-134a A/C system from Bouchillon. I'm fine with flushing the old evaporator (the only factory part retained) and installing the new components, but I've never charged an A/C system before. I usually operate on the principle that if I can acquire the tools and the knowledge for around what it would cost me to have someone else do it I'll do it myself. But I'm not likely to be doing a lot more A/C work and I don't want to screw up the new system. Any thoughts or suggestions from those with more experience would be most appreciated.