Separate supply of Worktop

[Final Q from me]

We’re having a little bit of trouble getting everything ‘just as we want it’ from a single, ‘bog standard’ kitchen supplier. From an installer’s perspective, Is it reasonable to source a kitchen worktop separately from all the other kitchen components? Are kitchen installers generally happy to cut a (supplied) worktop to the required length(s) or is cutting some worktop surfaces a specialist job best done before supply to the site?

Thanks for experienced installer’s...

Separate supply of Worktop