When DH and I were starting out, we bought a new build off plans, and moved in once builders were finished. So we had to paint, floor/carpet, do curtains, tile, dig and plant the garden, floor the loft, etc all ourselves. And as we were young and smashed broke, we literally did almost all ourselves (we got a plumber in to put an outside tap, and the shop sent fitters for carpet, but otherwise, it was us).
Less that 3 years later, a killer commute sent us screaming back to the outskirts of the city, rather than a commuter belt town. We bought an almost identical house, but 25 years old. Theoretically fine, but OMG the work we have had to do.
Still somewhat smashed, we did a lot of initial work ourselves. Repainting, new curtains, tiling in kitchen etc. But had to get people in for new windows to the back (replaced pine with uPVC) and new bathroom within 6 months. And since then, we've done a lot more (insulation, new windows to the front, extension out the back, loft conversion, garden landscaping/fence replacement, painted, built-in wardrobes, built-in bookcases, etc).
We have a very good local plumber that we call as needed. DH still does a lot of the electrics (changing lights etc) but we also have an electrician we can call when needed. We have just repainted DD's room - but that was the first painting job WE have done in years - we had got most of it done as part of the extensions, or once had someone in to do a number of rooms at once. We got a very good carpenter to do the cabinetry in the sitting room.
Partly, getting people in was about doing the job right. Partly a matter of time (we don't have the spare time to do things anymore - although lockdown has been good for that). And we have had the money to do it, and the time to plan it well.
We're here now 18 years, and it is quite different to when we started. The major works were slow to get done - once we'd dealt with initial priorities (the windows and bathroom) and done an initial cosmetic job (fresh paint and curtains ourselves), it was another 5 years before we updated the kitchen as part of the extension, and a further 3 years before we did the attic, with most of the other jobs being later again. And when DD was small, we didn't have the time to devote to diving into DIY and minding her, so that was when we started getting the professionals in.
Admittedly, now that she's 14, she is able to help properly. But with toddlers, don't plan on getting a lot done productively as you can only have 1 of you doing it at once unless you can get someone else to watch them. And you can't get as stuck into a job for a whole weekend, leaving tools and materials lying out overnight etc.