On my first AS put the numbers on individually, PITA. Cleaned surface with soap and water. 2nd AS took the numbers to a sign company and they made a one piece pull and stick. Actually there was backing on both sides, so you pull off the backing on the stickem side and place on AS. Then pull the top side backing off. Much easier. On 2nd AS used glass cleaner as the dealer recommended it for final cleaning of the AS.
2011 30' Classic
2015 Ford F250 4X4 Platinum