The accumulator on my Mazda truck has a hole and all the freon has been drained. I bought a new accumulator and wish to install it myself. I also bought the special tool needed to disconnect the hose. I have never worked on AC systems other than recharging it with freon. My question is, can I just simply change out the old accumulator for the new one? If it's that easy I am willing to do it. I will only need to know how much oil the system requires, how many cans of freon to use, and maybe other details. I am trying to stay away from the corrupt mechanics in my area. The only honest mechanic in my area retired a couple of years ago. Thanks.