U need to remove the engine mount, airbox
Auxillery belt and tensioner
crank pulley and side casing to get access to the chain tenaioner.
I just did the tensioner because the chain kit had only done 3000/3500 miles so swapped it out for a GM 1.
But if i was you n dont know the history, i would do both chain kits n make sure u get a pro to do it. Cos its a big job. @[deleted] is the chain expert.