Hey man Welcome to the Site! Putting the timing chain on a stock LUV engine is a bitch! The problem is you have to take basically the front of the engine off, just to get down to the lower part of the chain. Unless you have arms about an inch thick then you might be able to reach down from the top of the valve cover
Some hints would be to pull then engine out of the truck, its ten times easier to fix this way and only takes an hour or two if you know what your doing. Or, take the rad out, or your gonna end up scraping the back of your hand till its raw! Also take the hood off, for the four bolts it takes it makes things a lot easier.