Wear long sleeves, long pants, a hat, and gloves. Tuck your pants into your socks.
Use an insect repellent with at least 20 percent DEET. Better yet, consider treating your duds with permethrin. (You can't put it on your skin.)
Check yourself and whoever's with you after being outdoors. Ticks especially like areas where your skin is warm and/or thin: the groin area, armpits, the inner thighs, behind your ears, etc.
Take a shower and scrub yourself with a washcloth to dislodge ticks.
Washing your clothes doesn't kill ticks. You need a thorough cycle in a hot dryer to do that.
Never burn or coat a tick with petroleum jelly. Instead, remove it by grasping as close to the skin as possible and pulling gently but deliberately straight out. You may not get every bit of the tick, but that gets the parts you need to worry about the most.
Call your doctor.