Wonderful idea! As you see, there are several of us here who have made the transition and you have already received wonderful advice. Apart from those who have already weighed in, another person's posts to look up might be those of Elizabeth P; she started here with long dark hair and now has shorter silver hair!
My natural dark ashy blonde hair greyed initially very slowly (through my 40s). In my early 50s, several times I tried to make the transition from highlighting/ dyeing to going natural, but I wasn't quite "there" yet either emotionally or in terms of the proportion of grey. Then my mother died (in 2015) and about six months later, I realized I was ready in every way. No matter how ashy my hairdresser went with the dye, it felt too "yellow" against my skin, and grey started showing through by four weeks. I didn't like it.
Since my hair was short, it was easy to transition. I did one set of highlights no base, and then a big big chop. It only took a few months to grow out the remaining dye.
As Cat implies, whether you need to change your colour palette might depend on your skin tone and what you've been wearing up until now. I always wore cool toned colours and I still do. But I find that brighter, more saturated versions of my old favourites (blue, reds, fuchsia, berry, teal, purples) look better on me now. A light chambray will wash me out while a darker denim tone will light me up.
Silver and grey always suited me but look amazing now. Yellow never looked good on me and it looks worse now. I used to love to wear leopard print accessories to tie in with my ashy-goldy hair, but now they don't work as well.
Unlike others, I find black actually looks better on me than it used to, as long as I am wearing lipstick. Black and white patterns are also really great (as long as the scale is not too large.) High contrast in general works, even though I'm not super high contrast myself. (Pale skin, pale hair, darker blue eyes).
White is also great. I'm still more silver than white but white "brightens" my face and does work to bookend, as Cat said.
I actually find it easier to dress cohesively than I used to. If you search the archives you'll find a bunch of my transitioning posts from last year. I'm really happy I made the change.