I started out using 5x7 trays and they work well. You can shuffle your sheets in the chemicals. It takes a lot of practice. I've scratched many sheets from the lack of experience. There are also daylight tanks which I use. I have an old Yankee Agitank. I think they're OK and have gotten mixed results. I have a friend that has an HP Combi Tank. http://www.amazon.com/HP-Combi-Plan-...ies/B0000ALKEH
They work well too.