The one thing I would recommend is one of those medicine syringes. That will allow mixing straight from concentrate. I mix 1 liter, using about 15.7 ml concentrate with 984ish ml water. When I tray develop I can do 8 sheets of 4x5 using 1/2 liter for each 4, or in a tank I can do 4 sheets, as my steel Nikor tank takes 1 liter. The Patterson universal takes up to 1/2 liter.

The links above are awesome for information. Another good one is This site has a good chart to go along with the information.

I've used it with FP4+ and HP5+ with nice results. Even using one roll of film, just fill your tank full and you'll get good results. Don't let the frustration stop you, this can be a very rewarding experience. At least, for me it has!