SailorKeddy - The tools needed to disassemble and reassemble are not that extensive. You'll need a torque wrench, a good bench, a vice helps and then basic hand tools and lots of care and patience.
Get a really good manual for the engine. The first parts
are bearings and head
1 - disassemble the engine in to pieces, mark and bag everything - it will be a long time before some parts go back on.
2 - take the case, crank, rods and pistons to a machine shop with the manual. The machine shop should put the crank on a machine and measure and true up the crank. The machinist will tell you how much material he took off - important because the bearings you will buy will be "oversized" to match - this is normal.
3 - For the case the machine shop will put the bearing caps on and clean up the centerline of the engine - same thing as the crank on bearings. The case and crank are the heart of the engine. The will also hone the cylinder bores and maybe oversize them as well. They will "deck" teh surface where the head
attaches to make sure it is flat.
4 - Pistons - If the cylinder bore doesn't go oversize you might be able to reuse the pistons. If not new pistons are in order. The connecting rods will be checked for journal size and roundness as well as twist. A lot of folks (me included) would simply replace the pistons and connecting rods. In the big scheme of things this isn't that expensive.
After the case work is done it is a matter of getting bearings, rings and all and assembling the bottom end. This would be phase 1.
Phase 2 is the head - You can take it all apart yourself but you need some special tools and you don't save a lot of labor. I would take the whole thing (including the parts I sourced myself) and have the machine shop do it all.
Now you have basically overhauled the engine - you decide on the accessories. lift
pump, injector pump
It would be a rewarding experience to have done it yourself. And a darn sight cheaper...