I've been fortunate. I've only ever had one tick attach and embed over the past 4 years (at least as far as I've seen), although I've found multiple crawling around on the outside of my clothing. Because I react very strongly to poison ivy, oak, and sumac, I wear long sleeves and pants, even in the heat of the Mississippi summer. It means lugging more water around with me, but it generally keeps the plant oils away, helps reduce the number of mosquito bites, and makes it much more difficult for ticks to find someplace to bury their tiny heads. I also wear tall socks, and if I become really paranoid, I'll tuck my pants into my shoes over my socks (a very attractive look, btw). Also, if I know I'm in a location where I frequently see ticks, I check myself before getting into the truck. I give myself a good visual scan and a shower as soon as I get home, and usually only recycle (re-wear) pants. Everything else goes into a bin especially for field clothes.
Honestly, for me, a much bigger problem at my study sites are the hoards of mosquitoes. Because we didn't get very cold this winter, I have a feeling that they are going to be even worse this year. I don't like worrying about DEET, so I avoid anything containing it. I do have a DEET free mosquito spray, but it doesn't do much after 10 min of sweating.