Not much more I can add to the above really.
I'm now 50 but this time last year I weighed around 17.5 stone (I'm 6'2). I've since lost six stone, partly through a change in diet but mainly walking. I'd started going for little walks during lockdown, just to get out of the kitchen and away from the laptop. I was aiming at 8k a day, but now do 20k a day (which is around 7-8 miles). I try to do it in three chunks - early morning pre-work, lunchtime and evening. Finding the right Podcasts has been essential, as once you get into the right one, you forget you're exercising. It's also been great finding new routes, paths, shortcuts etc in and around the area I've lived all my life, that I never knew existed. It can feel like a chore sometimes, either when the weather is bad or when (in my case) you realise at 11pm you've done 19.5k steps and you end up trudging aimlessly around the house for 10 minutes to get to 20k. It has become an obsession, but one that will hopefully be of benefit.
Definitely weigh yourself regularly as with the right diet - I cut out my lifelong favourites such as pasties, pies, sausage rolls and, in particular, crisps - and plenty of exercise, the weight will definitely come off. One note of caution, it may cost you a few quid as I've had to pretty much invest in a new wardrobe for anything that didn't involve my feet!
Good luck