Unless you know precisely what you're doing - it can be very difficult. There will be no coasting or freewheeling on a fixed gear bicycle. If the bike is in motion - the pedals will be in motion - forward or backward.
"...do you have to tilt on sharp turns?" No more or less than a traditional road bike.
"And how can you slow down faster?" Lock your knees - in essence blowing them out eventually. Have good health insurance. You'll need it for that all important knee replacement surgery.