You can prune your burning bush now, it's not a problem.

Regarding watering, when you transplant something you have to play it by ear - a lot of it depends on the weather (temperature, wind, rain or lack thereof). You should check the transplants every day and if they show signs of wilting, then water them. However, be careful not to overwater - too much water is not good, either and can cause a plant to rot/drown.

If it's been a couple days since you've watered and the plant is droopy or wilting, then of course just go ahead and water - you can just assume it needs water.

However, if you're watering frequently, then you need to check the soil about an inch down. Easist thing to do is stick your finger down about an inch and get a feel for the moisture content of the soil. If the plant is wilted but the soil is moist about an inch down, don't water any further, let the soil dry out more between waterings.

If it's windy or the sun is beating down on it, that can also cause wilting even if the soil is moist. Temporarily cover the plants with something that will offer protection yet still allow air to get in there (e.g. pottery/planters with drainage holes, lawn chairs, rose cones with holes, whatever you have lying around that will work is fine).

There really is no set timetable for watering/protecting transplants - you have to wing it.