Using the online website to execute a cancel/rebook, especially when the Wyndham call center is open, is probably too risky for any reservation these days.
If you cancel a reservation, it's taking over 6 minutes for it to show back up for us owners using the website.
If you, or a VC, cancel a reservation, it takes about 20 seconds for them to see it (and still 6 min or so for us).
Thus if you are trying to use the website, while the VC's are active -- the VC's have access to that reservation over 5 1/2 min before you do.
If you really want to do this yourself, I would strongly advise doing it before the call center opens, or after they close. I would not risk doing a cancel/rebook while the call center is open.
That said, the VC's are generally great to work with. Talk to them a bit to be sure you are comfortable with them - their levels of expertise do vary. I've had one VC (that I've gotten a few times) refuse to do a cancel/rebook. He said it would be collusion if he did. He said that's what his supervisor told him. I hung up and called back. No way I'd want to work with him, even if he did agree to try.
Overall, I like working with the VC's. These days, it's much faster and definitely more reliable. In the past, I could pick things up faster than the VC's, that is no longer true. With the new captcha screens and system changes I consider it a must to call in.
Good luck!