I’ve always found the templates less helpful than just eyeballing it
maybe that’s the result of applying so many for myself friends and family over the years but
This is the first one I’ve put on with a template and it was much easier for me. Once I was sure the dust was off the screen it’s just a case of plonk it on the phone and leave it for 30 seconds. Much quicker than gripping the edges and lining up by eye for me. Whatever is easier for the individual though