Check out videographers who have a good social media following and a professional website with plenty of reviews and examples of previous work. I'd also recommend contacting them to check availability as soon as possible, and let them know what you'd like filmed on your special day. It's also important to discuss budget as there are suppliers, like me, who are happy to work around what you want to spend. A reputable videographer will be happy to show you examples of their previous work and will ask you questions to discover your wants and needs.