Basically if you want the Pfizer then you will have to wait and put up with some inconvenience.
You have to book online for one of the super vax centres and probably have to wait several weeks or maybe months for an appointment.
And on the day of your appointment you have to join a queue of hundreds of people and waste half a day.
A limited number of GPs have a very limited number of Pfizer vax, but again it will be difficult to get these.
If you feel OK about getting the Astra Zeneca then it is very simple.
Just book an appointment at any GP and you will get it done within a couple of days. In and out, very quick.