1998 Nissan Quest timing belt

That's way more than I have time left in my life to retype. You need a copy of the manufacturer's service manual. That will give you pages of instructions with line drawings, torque specs, and any special tools that may be needed. Chiltons and Haynes manuals are not good choices for this type of major job. You can usually find any manual on eBay.

You can also go to the top of this page, point to "Repair and Service", then click on "Manuals" to go to a page were you can buy a subscription for your van.