If it's a question of "can", then yes you very well can trade without any experience or knowledge. Will you be trading successfully? Then that may be a different matter altogether. Trading blindly is very risky especially when you don't know any indicators or have no idea when is the best time to to enter or make that trade. Not to mention leveraging and margins can definitely make you lose your money. The very least you should know the basics. Some exchanges such as Etoro even have assessments to determine your risk profile.
However, someone who reads tons of books about trading and has attended tons of classes does not always mean he can be very good in trading. Experience is still the best teacher. Not everything can be taught on paper.
That is the funny thing about trading that makes me laugh a lot time to time. Obviously someone who studied trading a lot, like even after years of studying and doing it, still keep studying it, think about it like being a professor of a subject at a prestigious school, you still keep reading to learn more and do not stop, yet you teach anyway while still learning more and more. A very good trader first studies and learns, then starts trading but still keeps learning basically becomes better and better and better.
We all know this person will trade much much better than a newbie, and 99% of the time a great trader will be making a profit while newbie loses money. However funny thing is, very rarely, there are times when a veteran and expert trader loses money on a trade that a newbie made a profit from, and that hilarious if you ask me and shows how trading depends on luck a lot of the times.