I used to "temporary pioneer" (75 hours for the first month, 100 hours for each consecutive month thereafter) one month each summer while I was in school, but then I got married right out of high school. By then it was "auxiliary pioneering" (60 hours a month), and I kept doing that for the first year and a half of my marriage. I felt guilty for not regular pioneering, but I couldn't stomach 100 hours of FS every month, especially with the harsh winters we had in Maine.
I had to get a full-time job after a while, and then I couldn't pioneer at all. Felt guilty, guilty, guilty, especially during those service meeting parts that gave the example of the blind sister with the unbelieving mate, 5 kids, and a wooden leg who regular pioneered. Or the parts that mentioned the fanatical zeal of the brothers in Japan where apparently there were whole congregations of pioneers.
Guilt got me to try auxiliary pioneering while working full-time. It nearly killed me.
Guilt got me to try regular pioneering twice, both times a miserable failure (because I loathed FS). Then I got to experience a different type of guilt.
So, yes, I felt guilty.
Pioneering, A Misnomer at Best
Scottleblog - The Odd Life of Jehovah's Witnesses