Oh right i got you now. You mean the drivebelt tensioner, not the cam chain tensioners.
Yes its an easy diy job, you will need to wind a threaded bolt into the top of tensioner body(not to far) to release the tension on the belt, then unbolt the 3 bolts holding the tensioner to the cylinder head.
Do not tighten the 3 bolts up too much when refitting, as they strip easily!!