Its easy on the W6V2 model, so its must be easier on the W7 because of a much stiffer suspension (spider). The spider seems to hole the coil pretty centered up when surround is removed.
MY TIP: DONT RUSH IT, DO NOT RUSH. When your removing the old foam you'll notice how old it is and dry-rot (easy to rip). Use 90% alcohol and that will help loosen up the glue. Once all the foam is removed, make sure its clean and smooth for the new surround. There are videos online showing how to properly do it I suggest you view them a couple of times to get a good idea on how to do it.
Once you finish I suggest you let it dry for atleast 24hrs, the recommended is 6hr or so but the longer the better.