Bathroom remodeling needs a lot of hard work and planning. You need to look into various areas like construction, repairing, plumbing, etc. Moreover, while remodeling unlike construction you need to figure out what to do with the existing structures and yet attempt to create a new model. You first need to classify the items that you will be able to reuse and those that will have to be replaced. It is however, economical to reuse as much as possible.
Thus, you may decide to keep the commode, as it never goes out of style but replace the tub and sink. Now another aspect to look into is that, with any remodeling the existing structures might have to be relocated and that may require professional touch. For example, even if you plan to keep the toilet you may need to shift it slightly to make space for new fixtures. Thus, a plumber will be required to fix the toilet again.