Having done both sides on both our vans (some more than once) I can tell you it is not a job I look forward to. However, it isn't the worst job by any means.
A few tips I've learned:
Use a good handle - $10 eBay ones often break again in a few months. Some don't even fit or work from the get-go. Best I've found are OEM handles from JY if they're still in good shape. Plus, you get to explore how it goes together on a vehicle you don't care about. Save the nuts in case you lose one.
Some door panel mounts on your 93 will probably separate from the panel. Plan on using some JB Weld or some other good adhesive to put them back on.
You definitely do not need to cut holes. You can if you want. I don't have a hole saw and did fine without it.
One 10 mm nut is easily accessed through the access hole in the door - pop out the plastic cover and you can see it.
The other (upper) is definitely trickier. You have to go by feel from inside the door. Or, as I just discovered not having the correct tools at the JY, you can access the top one by dropping the latch assembly. You'll need to disconnect connecting rods to other components to let it drop low enough so I'd suggest this as a "Plan B" - you'd be making one aspect easier but adding work on the other end. Just go slow and be patient using "Plan A" (working inside the door). I've found disconnecting the lock connecting rod makes it WAY easier to get to the top nut. Of course you then have to remember to put it back on, which can be tricky (have to go by feel.)
Manual dexterity is essential.
Pay attention to where the connecting rods go and make 100% sure you have them back before closing the door or putting the door panel back on. Test everything. Nothing like thinking you're done only to find you can't unlock the door with the key (don't ask me how I know). Or worse yet, finding out you can't unlatch the door from either inside or outside after you've closed it! (Never done that myself, but read where people have.)
Make sure your latch and post are well lubed so you don't have to pull too hard to open the door. This will help your new handle last longer.
I believe others have covered most everything else.
If you get it done correctly its actually a very satisfying job to have behind you. You'll pat yourself on the back every time you open the door!