There are SO many different factors that can turn make installing a wall box either a piece of cake, or an absolute nightmare !.
This has already covered above.
On a straight forward install, you are talking a couple of hours and your sorted.
But this is not always the case.
I guess it could be said, that if your home is fairly new and the electrics are in great shape, you have an easy cable run from your consumer unit ( fuse box ) and have spare “ways” inside the CU and you have the correctly rated main cut out fuse, then you are in with a good chance of a straight forward install.
But there is the other side of the fence, you live in an older type house, running on older type electrics, you are “Looped” by a shared supply with your grumpy next door neighbour.
The older type fuse board is on the opposite side of the home to where you want the wall box installing.
The service head ( controlled by the DNO ) has only a small size rated cut out fuse fitted.
This is the type of problems that you CAN come across.
This type of issues are NOT going to get rectified overnight.
The guy who installed my wall box, back in 2015 was fairly local to our home address.
He is both a fully qualified commercial and domestic electrician.
He came out to our address and did an appraisal of our suitably for having a wall box installed.
Told us what did and did not needed to be done on the day of the install.
This was extremely helpful and saved him and us a LOtT of what could have been wasted time.
Install in the day was completed in about two hours, this included some electrical bonding improvements needed in the gas and water supply pipe work.
I think you have done the right thing getting the ball rolling.
Scott’s moto - “Always be prepared”.
You have already decided that a wall box is right for you, so get it done I say !.
At some point, you are going to need one in the future anyway !.
I can only see them increasing in price due to demand for EV’s.
