If you go the DIY route, either pay someone to properly evacuate the refrigerant or look around for a used refrigerant recovery machine. I finally bought a used recovery machine 2 years ago and have used it several times since. Completely paid for itself. Many times over. You don't need anything fancy or speedy. Then get some good AC gauges and a vacuum pump capable of reaching micron levels (harbor freight makes a couple that work) and you are all set. You can even get your EPA card for vehicle work online. A short web course, $25 and a quiz and you are certified for life!

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles