My advice
You will make a mistake and put at least one popper in the wrong place.
You have (presumably) paid a fair some for the nice new cover
Pay someone to fit it who has done it before - they cock it up they replace it !!
Learnt that trick many yeras ago when I paid £300 for a mohair cover for a TR6 !!
Failing that, if you do do it yourself:
1) make sure the cover is tight by being nice and warm - now looks like a good time
2) stretch the cover over the studs on the car making sure it is central and tape it in place, then start in the middle andfeel through the cover to where a popper is on the car and pierce the cover with a bradawl, then remove cover from car and fit popper to cover.
3) repeat 2 for the second stud (adjacent to the first one you did)
4)Do them all one at a time, do not be tempted to short cut or you will invariably not get them tight.
When CC did mine for me (a few more quid on my SVA check bill) they did an excellent job, I really strugled to get the poppers on at first but over time as it stretched they were then in the perfecr position. Same goes for a boot cover
Mark
20 years with no points then I buy this bloody thing