Wow 5 years? What did you do when you messed up even a little bit? You're very dedicated, you probably had to buy another right? Or don't they come with interchangeable faces? I really love them though, I praise people as dedicated as you! Do your best!
Oh no, you don't have to buy a new one when you mess up! You seal them with a special sealant before you paint them, so if you mess up you can remove the paint and start over ^^ You can usually do that as often as you want to until you get it right!