Buy a set of R134 hot/cold side gauges, and study up on A/C systems for the DIY fix.
It can be but you need a vaccum pump and the disconect fittings for the automotive type fittings and all that other garbage. Refrigerant is about $35.00/lb so you won't be saving much in the long run.
2000 2dr. black GTP|Headers|3.1"|xp'ed|ported s/c|HPT & aem wb|3.29's built trans|19° timing|0°KR
Turbo/heads /big cam build starts soon!!!