Size: When it comes to the size of the shower enclosure you want to make sure you hire a professional to template the space. Keep in mind if you are going to want a swinging door or a sliding door because this will affect the size and placement.
Clips Vs Channels: There are two options when it comes to the structure of the shower enclosure. The first option is to go with clips which often offer a more frameless look. You can often order the clips in the same finish as the hardware so that they compliment each other. Channels are often a cost effective solution because you do not have the added expensive of clips or drilling holes in the shower glass. Although you lose the frameless look because channels run around the edges of the shower glass. (see pic above)
Shape: The shape of the shower enclosure is a large element in my opinion because it can really make the space. If you are just remodeling the shower in your bathroom, it is recommended to go with a shower enclosure that is the same layout as the original. This will make for a cost effective solution, as well as easier installation. However, if you are remodeling the whole space there is nothing wrong with changing up the shape of the shower enclosure. There are multiple different shapes to choose from depending on your taste. You can do a simpler rectangle or square, a curved shape, or a neo-angle shape. A neo-angle shape is perfect for corners and will fit perfectly. More often than not they have a hinged door that can either open from the right or the left.
Fixtures: Remember that your shower enclosure is most likely going to be some sort of glass that you can see through. So when it comes to your fixtures you want to make sure you pay attention to the finish and style. You can really be creative and add interesting fixtures to spice up the space. I recommend a rain shower, although I am biased to their stress-relief benefits. You can also have a hand shower, a corner shelf, and a nook for your shampoo and soap.
I have mentioned this before, but I want to mention it again! Remodels are supposed to be fun, try and enjoy the process as much as possible because it will be worth it in the end. A shower enclosure adds an elegant addition to your bathroom remodel. If you have any tips about bathroom remodels share with me in the comments!