Experiences with Retrofit and insulation consultancy

I’m looking for a survey / review of the Edwardian terrace I’ve just moved into to identify the areas we should prioritise for upgrades.

Separately but related, we’re decorating the master bedroom and I want to get advice on wall and floor insulation (and then maybe the work itself done too - given everything I’ve read on here in the perils of doing it yourself!)

Anyone here got experience of procuring that kind of work? Any advice? Where did you start?

Thanks!