Make sure you get to know your wedding photographer when booking them. Have a little chat with them, get to know how they shoot and see how they fit with you and your wedding before choosing to book with them. To be fair though, all the photographers that I have met and worked with are all nice and lovely people so most will not have any problems choosing any wedding photographer. At the end of the day don’t overthink this process, if you like their work and they are nice people then they are the most important things to consider as that will make sure that they will do the best to their ability to help capture your wedding.
NOTE: I am nice so please have a look at my work and feel free to contact me anytime with any questions you may have and check availability.