I was going to recharge my A/C myself. For $20 you can get yourself certified, to remove and recharge, it's an online course
http://www.macsw.org/MACS/Section_60...d-27fd9b9153f6.
Not sure what the rules are in Japan but here in the U.S. this is all you need to do it legally. There's other Youtube videos and online courses to learn more, along with your FSM. Why pay someone you don't know, when you could spend roughly the same amount and learn yourself? You can't trust anyone more than yourself. The most expensive part is the equipment, but you will own it and always have it.