Easy if you follow instructions
I had no issues adding the lettering to my mailbox.  You have to make sure it’s fully smoothed/attached onto the surface before you pull off the backing (per the instructions) but I had no problems.  It’s withstood all kinds of weather at this point, so I would say it’s a very good product.  There were lots of lettering fonts so spend a little time making sure you get the one you want.
Rating: 5 stars