In reply to Climber Liam:
> main question= should i get a joiner.?
My question: Do you have the tools, skills and time to do it yourself? Buying the tools will cost less than a joiner will charge per hour.
DIY bouldering wall is an easy build but requires a little care and thought where it's supported to keep you and your house safe.
If you do some searches on here there's loads of ideas in old threads from the absurdly complex to the ingeniously simple.
All I can really say is "I'd do it myself" (and have) but that's me not you, you could be a clumsy oaf* who'll saw his fingers off :-P
jk
*no offence intended, I know someone like this, he's a smart guy but you wouldn't let him run with scissors!