I believe rabbit manure is the highest-nitrogen animal manure, so I would hesitate to add it too generously around plants such as tomatoes. You could get HUGE plants,and very few tomatoes. And if you are making what is essentially compost tea with rabbit manure, it is much safer to run an aquarium bubbler in the bucket. Without oxygen, any manure mixture can create some really nasty pathogens, including e.coli. That's not something you want on your lettuce . . .

Tigerlady, use a really sharp knife, or sharp scissors. Cut the whole plant, and do it a bit lower than shown in the photo. Leave about 1 to 1-1/2 inches of the plant so it can regrow. It may regrow even if you cut too low, but it will take longer. If you cut too high the leaf "stubs" will die back and rot. Experiment until you get the hang of it. You can generally get two or three cuttings off lettuces and spinach before it's time to re-seed. Hope this helps!