Well, all the bits arrived today.
I had cleaned both rims yesterday so they were ready for the tape today.
Went with one layer of electrical tape first and then the rim tape over that. All went well nice smooth tape application. Valves fitted no problem.
Put the first tire on and went round the rims with some soapy water. Hooked up to my cylinder and got a semi satisfying crack. Quickly fitted the valve body and then pumped up to 60psi (max rating for the tire).
Repeated for the other tire. Only issue was a stubborn slow leak from the tire bead where the rim join was.
Left both for a little time and then let the air out and put the sealant in through the valve.
Pumped both back up with the track pump to 60psi and did the sealant dance. That seemed to stop the slow leak as well.
Can't hear any air escaping, will check pressures tomorrow....
Fingers crossed.