Back in the States, I had all the equipment and gear to work on my own A/C system on an '86 5-liter Mustang. It is not for the feint of heart. You need a quality high vacuum pump (runs around $300-500), a quality freon gas detector for leaks (runs around $400), a set of high/low pressure gauges, as well as various connectors and adapters. I also had the help of a pro A/C shop who gave me advice for free.
When your A/C goes away, take it down to an A/C shop and the bill may run $900-2000. There's a lot of ripoff shops around that will tell you the evap needs replacement (which requires removing the whole dash) when all it is is a minor freon leak which can be fixed by replacing a $5 o-ring, then recharging the system.
When I bought my V-8 'Stang, the A/C was dead. The A/C shop quoted me $900, saying the evap was bad. Instead I used the money to buy pro tools and fixed it myself (there are some manuals around that tell you how to do it). The A/C shop was a crook, because I removed the dash, cut into the evap box with a hot knife, and found out the evap was fine! I replaced it anyway and hot-glued the box back (a tip the pro told me about). I then converted to R-134, which you don't need a license to buy.
It's great to do it yourself since you can do the job right: replacing all the o-rings when the system is down, as well as the expansion valve since it's cheap, and I put in a new canister (forgot what you call it). I also cleaned out the condensor well with solvent and compressed air.
But then again, I do all my own automotive work like rebuilding and blueprinting race motors, rebuilding transmissions, as well as doing autobody work and refinishing. (yes) Rebuilding automatic transmissions is another can of worms that requires specialized tools, but I already had the precision measuring instruments like mikes and dial indicators from engine rebuilding.