I tried to start many books/video courses to learn QFT but this failed because of many factors, including my weak math/physics background, laziness, lack of time, lack of persistence, just to count some. The whole blame is on me, no doubt. Still, if I was able to learn QM to some extent comparable to 50-70% B.S. (only around 40 yo., before that the same reasons worked for QM studying as well), there must be some way to proceed further. Can somebody recommend (from their experience) some way to go into the domain of QFT? May be some set of books from easier to not-so-easy that worked for you, may be some particular video courses that worked in some similar situation?