If you just want to do the belt, tensioner and the idlers its not bad at all but that only part of the job if you want to do it right.
Cam seals, crank front seal and water pump should also be installed. I install a new thermostat and upper and lower radiator hoses while its all apart.
Be very careful buying parts for this, stay well clear of Gates, Dayco, Goodyear, etc they use single roller idler bearings (OEM is double row), lower price but not good quality.
Use the kit from Aisin who is the original supplier or OEM. Google for Aisin TKF-001.
The reason you should remove the oil pump to put a new seal in is the pumps have a habit of screws loosening in the rear, its not uncommon to find a couple loose. use red loctite on them.
Use blue Anaerobic Gasket Maker on the oil pump not RTV, there are lots of horror stories about sloppy RTV use breaking loose and plugging the oil galley. Anaerobic Gasket Maker stays a gel until it is void of air, meaning it wont solidify and clog anything.
It has proven itself in this application for years with huge success.
Cam seals are know leaker's on these things replace them but be careful not to knick the cam seal surface, drill 2 small holes and use sheet metal screws to pull them out.
Lube the lip of the new one with #2 grease and coat the outside of the seal with Permatex #2 non hardening sealer.
Install the oil pump seal after you have the pump back in not before. grease and #2 like the cam seals.
This is not a difficult job but it can have a few pitfalls, just take your time, be clean and follow directions. If you need pictures with detailed instructions and timing marks i have them, just PM me.