When working with seeds or seedlings, I do use a potting table that Dh built for me. It's taller than most because I'm 5'8" tall. Works great for little stuff. When I'm doing big plants I take a metal chair or anything comfortable for me to sit on. I have a tub that I got at a local Home Depot that's made to mix mortar in. It's low on one end and works wonderfully for soil to be mixed in and then to get it out of easily. They sale these things on garden websites for big bucks but I checked they are 12.65 now, when I got mine about 5 yeaers ago it was $6. I bought two, one for the table and one for outside. I sit with my tub of soil between my knees(this is where the height of the chair is important) and put soil in pots and plant the daylilies between my knees. I worked like this last fall and repotted 800 plants into nearly 1500 pots. I spent from mid July to mid November doing this many hours a day. I had my metal chair where the legs would be lower to the ground in the front and I didn't have any back pain to speak of if I got up and walked around ocasionally. Which I had to do when I got about 6 pots done to get them out of the way.
This is my way. It's cheap but works great for me. I'm sure there are many many ways to do this.
One more thing. I use big plastic storage tubs for soil and fertilize and anything else to keep stuff in. I lovem!! If you have to leave them outside, I would recommed getting Rubbermaid. I have 2 huge square ones that I got on clearance many years ago, maybe 10 or more, and they are still like new and they have been outside in the weather for that long. They last!
