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Hudson Reed Contemporary Kew Slider Rail Kit

Complex communications
Lets say you need 7 different skills to complete the job and you want to get quotations from at least 2 people from each skill. You will need to find 14 people, talk to them about the job and then ask them for a quotation. Not all of them will want to do the job or be able to do it due to other commitments so you might end up approaching a lot more than this.
Small bathrooms may not be as easy as you think
Remodeling a small bathroom presents it's own special problems simply because it is small. Don't fall into the trap of thinking it will be easy because you will have to deal with finding and positioning bathroom fixtures and accessories that are small enough to make the whole thing work. Be prepared to spend a lot of time accurately measuring things and playing with cut-outs on square graph paper.
If your bathroom is very small then you will need to consider how many contractors can practically be working in the space at the same time. This could have important implications on your project plan.
Take advantage of multi skilled contractors
As you talk to people you may well find that some of them are prepared to tackle more than one of the tasks on your list. For instance you might find a bathroom fitter that also does tiling and painting or a plumber that is also good at plastering. Taking advantage of multi skilled contractors can make your task of coordination a lot easier so it's well worth considering hiring them even if you think that they aren't the absolute best at their second skill.
Plan the project
Are you stressed yet? You haven't even started the job yet. When you have selected the people that you want to do the work on your bathroom you will need to plan the work and get each of the contractors to commit to turning up at the right time to do their part of the work. This isn't easy either because these people don't like being committed to dates.