Easy enough to do yourself with one of those. Bear in mind with a new rubber, you're gonna wanna use plenty of slip to get it in. New rubbers are always tighter than the originals. On originals I'd usually just use glass cleaner to slip it in, but with a new rubber, I'd probably use a spray lubricant. Then take the time to clean (with a hand wipe type) under the rubber to remove any lubricant, and seal with Arbomast. It's unlikely an Escort will leak, but for the sake of it and piece of mind, I'd seal it.