Theres a Butchers in Rodbourne that looks alright.I dont go in because I dont know what to ask for

Ive got an irrational paranoia about looking stupid in shops like that.Same as Delis and Fish counters in Supermarkets.
Stupid I know but thats the way it is...
Its pretty simple. Just go up to the fish counter and ask for a piece of fish. Job done. Just had some nice Sea Bass from Morrisons tonight.
Its not that simple in my mind im afraid.I'll play these situations over in my head to the point of a tizz.
What sort of fish - well, what do you fancy sir???
What size - an 8oz fillet should be more than enough per head.
Will i end up with a huge fish that i cant afford - see above
How will I cook it - pan fried, little bit of olive oil, seasoning. Easy.
Do i ask for the head to be cut off - Hell yes
Do i ask for it to be gutted - yes, unless you like picking bones out.
The scenario becomes more complicated the more I think about it.