the valve does not come out completely,only the stem,guide,seals,lock ring,springs and intake valve. You will need the tool,but these guns were designed for owner service (at a time when most guys HAD to be handy.) Watch how it comes apart,if you have any problems email me and I'll send you an exploded pic with the parts in the right relationship.I's not hard ,I didn't have any drawings for my first few...