your best bet is going to be to have a shop do it, unless you have an a/c vacuum.
only reason i say this, is because on my previous cars, like, my acura cl, i evacuated and recharged it, but just did a 15min vacuum and dropped the ac temp by nearly 15 degrees, thats worth it in itself.
where are you located? i can recommend someone that wont fuck your face off to do it.