You can change your IRS and professional contacts online. Filling out that change of address form at the post office notifies most financial institutions. When we moved, I hadn't yet gotten around to notifying Vanguard, bank, etc, but their mail started arriving at our new address. Landline may come as a package deal with your internet provider so you may just port your number. I am not comfortable doing financial anything on my cell so keep the landline for that purpose plus the fax. Also, see how cell service is at your new location before you bail on the landline.
You are not addressing the really big hassles about moving (trying not to think about them?) We moved two years ago and we will NEVER do it again. It is work going through every single thing you own and deciding what the heck to do with each and every one (keep, sell, donate, recycle, junk). Then you have to do those things (pack, sell, donate, recycle, junk). You have to get the old home ready to sell (fix that drip, paint the bathroom, replace that screen, etc.) In your new place, you have to decide where to put everything and unpack it all, realize what's missing and go buy it (shower curtain hooks, door mat, electrician to install extra outlets, whatever). Take as many CPEs in January as you can because you won't have any more time.
That said, it can be so worth it! We love our new home and community. As for retirement, weigh how much you love what you do against how much you love to do the things you have planned in retirement. (Definitely have plans.) It doesn't have to be all or nothing. Keep a few select clients, or work at a CPA firm just during tax season, or ditch it all and have fun doing the things you haven't had time to do. They're all good choices so you can't go wrong.