Knowing what to do at a bob in Cambridge is not a problem; it is, as they annoyingly say, "just the same as Plain Bob".
If you are just about to dodge in 5-6 (up or down), you are unaffected; note that this is always at the single dodge in the "One and Two" or "Two and One".
If you are about to dodge 3-4 down, you run straight in. This comes just after the backwork, as you would be expecting to start all your 3-4 places down.
If you are about to dodge 3-4 up, you make fourths. This comes at the end of 3-4 places up.
If you are about to make seconds over the treble, you run out. This comes after the first half of the frontwork.
BUT, the problem is usually what to do next. You need to latch on to your new place on the blue line as quickly as possible.
Running in is usually easy, as you're used to the blue line starting with 2nds place bell; you dodge with the treble, and do the second half of the frontwork.
Running out is OK too; you run right out to the back, and do all the long backwork; you will be reminded by meeting the treble in 5-6 down, which tells you to make 5ths and dodge 5-6 up with it too.
Making fourths causes the most problems; but as in all other methods, making fourths causes you to go back and do the reverse of what you have just done; it's symmetrical. So, having just done almost all the 3-4 places up, you make 4ths, then do the places down. The treble is a good pointer again; keep doing 3rds and 4ths alternately, until you meet the treble for the 3-4 down dodge. Then make 3rds, 4ths and do the last dodge before going in.