1. The width isn't that big of a deal, but the diameter size between fractional and decimal will cause a problem.
2. I agree, Kevlar beads are a pain, but not because they are hard to stretch on. They are a pain for me to start them on the rim without falling off. Steel beads just seem to sit in place better for me.
If this is the same tire as the 1.75 tube vs. the 1 3/8 tube, then the diameter is wrong. If you are trying to get a 26x1.75 (559 mm diameter) on a 1 3/8 (597 or 590 mm diameter) rim, then yes you will need much stronger hands and the tire won't fit.
3. Soapy water can help get the tire on a tight fitting rim, like Maxxis or a Campagnolo. I had to use some the other day. I couldn't get the tube to lay inside the tire otherwise.
4. Not that important. Usually after the tire is on, you can slide it around to get the valve straight. But it is a good idea to try to do it from the start.