I'm looking to paint my bright yellow bedroom a light grey. I've never painted before and have no idea on cost expectancies or how to do it.?

Home Depot has color swabs that can be very helpful and the staff is also very helpful. make sure to keep your furniture color in mind so as not to clash colors. you want to compliment your room not clash with its contents. a grey ombre can also be a nice touch if you want to do more than just solid gray. Remember that its a fun and creative experience to redecorate so just have fun with it and relax :) Also u can type yur question in the ineternet search bar. So many people out there, someone is bound to of had a similar question :) Good Luck!