You may be ready...it's difficult to tell when i don't know you and have never heard you play. Pick out the hardest sections. Give it a try and if you're not ready, you're not ready and you'll find out fast!
I don't agree completely. Sometimes it needs a lot of trying before you realize something is too hard. But give it a try though. No practise time is wasted if you keep relaxed and patient!
The hardest piece I could play was the first movement of the Pathetique as well! In fact, I could only go about 140, too! My teacher (who yes, is very good and experienced) recommended the 2nd Scherzo to me as an option for learning this next year or two. So I say, go for it. I picked a different Scherzo because I liked it better, but the second one is awesome. It will probably take us both a good while to master our scherzos, especially depending on how much other stuff we have on the go simultaneously, but as long as we are learning and developing in the process, who cares. Just my 2 cents. What does your teacher say?
I'm sorry but these last years I'm almost autodidact (that's why put my post there) . Because I travel and pass two or three months without a piano, I just study pieces when I have the time.