For the OP:
congratulations... now you just have to follow through
For me, ours was a "cliff" situation- -
When we decided that it was "time" (largely predicated by spouse's RSU, bonuses, and the like...and my completing enough for pension and retiree health insurance) then once spouse was close... we put house on market. It was years ago, and in an area that otherwise wasn't a "hot market", and I'd expected that it might take a number of weeks for an offer and then close within a month.... got a very good offer in two days!. We'd purchased our "retirement house" earlier in the year (after years of search in the desired area, as those with our wants didn't come up often and, in general, there just wasn't that much availability).
So, I ended up in a temporary housing situation for about three months while spouse was a thousand miles away in the new place... in a very real case of "you can't go back" !!
HR wasn't local... I had put in my "package" to the distant HR and then awaited to hear if there were any glitches before any formal announcement to the boss. I was a senior technical and was often doing technical review of others in about the same level.... and also developing other projects. I certainly wasn't worried about being let go early and was developing the project that others could finish once I was gone (but I had nail down lots of things for that project, and others didn't have anywhere near the background I had, so I was left pretty much untouched so as to get it to some resolution. AFA training replacement... the usual.... they waited until about three weeks before I was to be gone... and that individual didn't really try to contact me... I'd just insured that copies of everything about the new project was in the hands of my director and immediate super... my other project I'd gotten to completion and early implementation. On my last day it was turn in badge, let IT know of location of computer (it never leaves the building) and turn in all keys/security items.... then start the long, long, long drive to the retirement home thousands of miles away... never to darken the door/gates again !!