Pools ain't too hard. Just get yerself a slim jim, start at the head, and work it between the water and the bottom structure (try to keep up with the current). You'll find you need a big tarp as you near the tailout, and depending on the size of the river a truck with a lift gate helps, but some pools I've "borrowed" have fit in the back of my buddy's Subaru Outback.

Riffles are a whole different story. Here you'll need to heat the river to peel the water from the bottom; a commercial blow torch or old flamethrower works perfect. Again, a tarp comes in handy, as do several rolls of wax paper--you can stack the sections as long as you lay them flat and separate them with wax paper. Don't try to use newspaper: been there, done that. Instant swamp!

True affecionadoes, of course, prefer the most challenging sections as targets: waterfalls. I haven't targeted these specifically, as the many floor jacks, scaffolding, and lengths of PVC tubing required don't fit in my buddy's Subaru--but just you wait! One of these days!