Just finished processing 4 rolls of stuff I popped off casually at a state park.
Conclusion --- If you are reading this wondering if E6 processing is overboard or too hard, it's not and it is WAY COOL to unroll those slides and see the actual image in gorgeous saturated color jumping out at you. I'm a convert.
I bought a cheap roaster from Wally world, and I'm taking it back, since it didn't have very good temp controls. I ended up just using a water bath in a cooler just like I do for important B&W work, except I was using a kettle of hot water more than ice. It took a couple hours to get everything pretty stable temp-wise (probably me being over-careful.... could have probably dialed it in sooner.) My hot tap water is around 120* F, so that's a good starting point for a bath to get things warmed up.
I still might look into some kind of cheap, semi-automated temp control like a roaster oven or aquarium heater, but now that I've done it once, I'm not scared of the process. Thanks again all for the advice.