The tensioner can be one of two styles. Both of them unbolt and slide out. Going back in can be a little tricky fighting the pressure since you are supposed to pre-load them.

Get your diagnosis done first. What amount of chain stretch do you have?

If the guides are trashed then you remove the slide pins and replace them. I believe the top guide also has a bolt.

To get to the bottom guide's slide pin you should pull the radiator, A/C condensor, harmonic balancer, water pump pulley, and possibly the A/C bracket. I don't remember for sure on the A/C bracket. It can be done without pulling the radiator but it makes it SOOOO much easier seeing what you're doing.