Hi Lyss, the 1u is a sensible starting dose. (Some vets prescribe starting doses that are way too high... )
As others have said, the curve numbers your kitty will get at the vet may be very different to what you'd see at home. Home curves give better data, because the whole point of a curve is to try to see what happens on a 'typical' day, and a day a the vet's clinic is not a typical day...
It's great that you're considering learning to hometest. It is THE most useful thing to learn in terms of managing your kitty's diabetes and in keeping him safe from hypo.
For cats already on insulin it is super important that you learn to hometest
before reducing the carb content of the diet. You'll need to be able to monitor the effect of the diet change on your kitty's blood glucose, and reduce insulin as necessary to prevent hypo.
While most cats can be hometested, not all kitties take to testing like 'ducks to water'. Some do take a bit more work. For example, my new diabetic (adopted in Feb) didn't like her ears touched
at all at first.

...But, after years of dealing with feline diabetes I knew I had to test her to keep her safe, so that meant
finding a way that worked for her.
I did various things to get her used to the process, breaking it down into various elements.
I got her used to the lancing device by clicking it and then giving her a treat. Click, treat... Click, treat... I'd rattle the test strip container and do the same thing. She very soon learned to regard these sounds as a positive thing...
She loves being stroked, so I'd stroke her or brush her and then gently hold or massage one of her ears, just for a second, and then go back to stroking or brushing her.
Or I'd go to wherever she was in the house, talk to her softly, stroke her, hold her ear for a second, give a treat, and then walk away.
In all cases she was left with some kind of reward.
I know it might sound like a lot of work, but these are all really quick things to do. They just take a few minutes. But the effect of doing them can be profound. Repetition is key. At one point early on I was doing these kinds of things 6 or 7 times a day. In less than a week her attitude to testing had already changed significantly.
Now, when she hears me getting the test kit ready, she goes to our 'testing spot' (her favourite armchair) and waits for me... Bless her....
In my new girl's case I've found I can incorporate a test into a little cuddle and grooming session, and she barely notices the test.
With my old diabetic boy - who was strongly food-motivated - I'd crumble treats to distract him and test him while he was hoovering up the crumbs.
And the more calm and 'matter of fact' we are about it, the more likely it is that the kitty will be OK with it. Our own attitude and demeanour can make a big difference to the outcome.
Eliz