Watch youtube to learn how to disassemble your machine. The rest is just common sense. Well, the nut securing the spindle pulley on may be RH thread or may be LH. That seems kind of random. When I get to that point I wrap a Vise-Grip chain wrench around the pulley to get something to hang onto and then use a big socket to crack the nut free. If you guess LH and it's RH it will be obvious.
The rest is a handful of bearings plus some cleanup work. Maybe the work light will need replacing. I replaced one with a generic one I found online. Had to modify it a little but in the end it worked great.
If you do need a specific part e.g. the worm gear in the table raising gearbox, you'll have to search Grizzly and Jet manuals to find one of their old machines that looks like yours, and buy their part and hope it fits. I am 2 for 2 doing this.
I encourage you to plunge on ahead and keep your wits about you and in the end you will learn something.
metalmagpie