If it is your own design, make sure it is good enough quality to tattoo. A good artist might be able to tidy up, or create from a design - but if you have something specific, then you should know how it should look better than them.
Take your time and choose the artist you want to do the work. A couple of good friends and an ex and her brother have had quite extensive work done - they have used different artiists for different themes - and all were expensive. By contrast my tattoos are simple and any half decent artist could have done them with the prints/artwork I gave them.