For me, gagging means I'm trying to eat something that I shouldn't - either it's the wrong food, or I've had enough of something.
I might add that I do get myself mentally prepared to eat raw food. In my mind, I make sure to address the cultural objections that I might be thinking. For example, instead of thinking that raw meat is disgusting, I realize that cooked meat is absurd ("Why would I kill a food animal and then put it in the fire?"). Reading some of the authors, such as Burger, helps me get in the right mind to eat raw.
Finally, I favor tender cuts of meat, such as the loin. Lamb is my favorite. A reasonable price range for me is 8 - 11 US$ per pound. Cheaper food was just ruining my health, so it costs more in the long run.