I second that, I learned the "trade" from a electrician friend many years ago and ever since I did all installations past main house entry fuse myself. I wired my 200m2 office / workshop with complex 3-phase setup (several cascaded distribution boxes) for industrial machines.

It really is not a rocket science, it takes a lot of time to do properly but is kind of meditative job.

Once done you can call up "inspection" by professional electrician, he will want to see your wiring plan which should include all wire gauges and fuses, then he will check actual installation:

• All fuses should be clearly labeled and that labeling match to plan.
• Ideally cables should be labeled as well.
• Sockets should ideally also have some kind of label on them (inside will do too).
• Distribution boxes should have a reasonable wire routing in them, not just a birds nest mess of cables (leave a lot of spare cable for that, you'd be surprised how long proper routing can be inside of distribution panel.
• All phases should be connected to proper socket and fuse pins, this one can be devious, besides the obvious "do not connect ground to power pin" you also need to make sure N and L are properly aligned. Electrical appliances do not really care but for safety reasons you should make sure they are properly aligned.
• All sockets with ground pins shall be properly grounded.
• All sockets that can potentially have exposure to water (bathrooms, outdoor etc.) should be connected to FI fuse. But I would advise to use FI everywhere anyways.

Cheers