not familiar with the Manchester scene, but simply call them - tell them you saw their profile on adultwork and say when you would like to see them and for how long , simple as that. They then text you the street name and postcode near the time, and you phone up or text back just before the meeting for the house number or hotel room number, that's it.
Money changes hands when you walk in.
If you want anything that isn't on their likes list or just want to re-confirm what you want with them then just ask, most are fine with it.
I have found the more mature ones (what you seem to be after) are very accommodating and have heard it all before, so no need to be nervous and you won't be asking anything they haven't heard before (i hope
)
good luck
