dobber: I would think that instructions would come with the kit. If not, possibly a Small Arms of The World would give you a breakdown and cleaning sequence and I know there are machine gun forums on the net where you can obtain much more information. Possibly even right down the ladder here at Graybeards in the full auto forum.
Did you mean convert from 06 to 308 instead of 308 to 06?
The A4 was a 30-06 cailber, at least it was when I used one. A conversion down to 308 will require a barrel change and possibly the feeding guides as well. If yours is in 06, leave it. If it's in 308 and you want 06, it will take a barrel and possible the guides.
There are chamber adapters to convert 06 to 308 - its a very small sleeve that is lock-tited into the chamber of an 06 that allows 308s to chamber and shoulder properly - if you get one of these you may not have to fiddle with anything else. HTH. Mikey.