It's not hard as long as you enjoy physics style problems, for mechanics you'd be given a scenario and have to calculate how far a ball is projected, whether an object will topple on a slope or not, whether a ladder will slip at too low of an angle etc, it's just application of concepts, although if you mess up one part of a question, it can cost you a large amount of marks (only 5-7 questions in the exam), an entire question can easily be 16 marks of 75 total.
FP1 is a bit more tedious but it still has useful concepts which you need for maths related courses.
If you're interested in the topics, it's not difficult at all.