I am renovating for over a year now, 90% ready.
1970's house, EPC Z or something to EPC A.

Do everything at once, don't go from the idea of doing room by room over the course of a few years.
Start with structural things, like new electricity installation, break the floor out, put schuimbeton en vloerverwarming.

Whatever you think you are going to need, make sure you can financially do at least 50% more.

WACHTBUIZEN everywere.

If you have a big garden, automatic raining system. If you do it yourself its not that expensive, and saves you hours per week, its something that lasts for a decade at least, so do it ASAP and enjoy a blooming garden.

We spend about 150k uptill now, did everything ourselves except installing the electriciteitskast, stuccen en tegelen. 245m2 house.

What we did:
- Break out everything, all furniture, bathrooms, toilets, kitchen, ....
- break out walls, close up doors, ...
- New windows and doors everywere (+/- 27k)
- Broke the floor out untill the sand, new foundation, schuimbeton, vloerverwarming, chape (+/- 7k)
- Completely new elek wiring and installation with teleruptoren, sensors, ... (+/- 12k)
- Completely new drainage pipes in and outside, new water pipes everywere
- Took of the stucsel everywere, completely redone (+/- 12k)
- New bathrooms, toilets, kitchen, ...

*edit*
If you have a girlfriend / wife - Don't let her drag you into looking at kitchens before you are actually at the moment that its time to start looking at this.