My advice would be to stay on top of current affairs and basically make an economic country profile for the UK, another developed country and a developing country - your teacher should be able to help you with this. This comes in handy when you're answering case study questions be it on microeconomics, macroeconomics or both (synoptic paper). Definitely make revision resources as you go along, do a lot of exam practice and practice the basis - the maths skills required in A-level Economics if maths isn't your forte and of course, practice sketching various diagrams and make sure you don't spend ages trying to sketch a random diagram. Hope this helps!
So, overall, I wouldn't say it's too hard.
Overall, it's not the hardest but the exam technique can be a bit annoying sometimes. I suggest to take it if you are interested in learning about economics.