ok hope this helps:
1. check out
1mzfe power steering belt install
2. Thats what i did, use the bolt to tension and measure about 1/4" deflection when you push down
3. Yes, the spring should tension that belt, but you can also slightly push up on the pulley to increase tension then tighten bolt.
4. I went the easier way and purchased a camshaft holding tool.
5. To tighten the crankshaft bolt, i removed the air-box and starter and wedged a pry-bar in there to stop rotation as someone else torqued the bolt down.
By the way save yourself the future headaches and replace the oil seals, and water-pump while you have it apart. Good luck!