I found A level physics decidedly tricky at times, I will be honest. However, in hindsight, I think that is because it wasn't as theoretical as I was hoping it would be. I felt laboured by terminology, by 'structured' exam answers, by having to write a specific number of significant figures - the list goes on.
Indeed, for me, the scientific method is what hindered me; I felt it lacked a certain mathematical rigour. Nonetheless, remember that that is just my opinion. If you think you would enjoy learning in breadth rather than depth, then it definitely could be for you, especially if you already have a vested interest in physics. In this regard, I wouldn't say it is extremely different from GCSE level physics in terms of style, but it is definitely a step up in terms of difficulty as I recall vividly.