When I'm out mowing the yard, or gardening, I rub a few drops of Motor Oil on my arms and cheeks, That 'smell" seems to keep me from getting bitten. However, if I go out into the woods, I spray my arms with Deet, and my boots and pants legs with a fairly diluted mixture of Malathion.....to keep the tics off me. If I DO get a tic, I Never try to pick it off, manually. Instead, I put a few drops of liquid hand soap on it, and it quickly backs out of my skin...at which point I can safely Mash it.
Needless to say, when I'm done for the day, I wipe myself off with a rag at the garden hose, and hang the clothes in the garage to keep the smell out of the house.