Take all your required breaks when you are supposed to take them. Do not accept help, do the work they assigned to you.
Good advice but it can be tough for low seniority/inexperienced cover drivers to follow. Until you know your way around a route, it's hard to judge whether you'll be able to make service without help. But yes, definitely don't give away resi stops unless instructed.
I err on the side of putting the ball in mgmt's court and clarify that I need help making service. A few weeks back a sup questioned me about taking too long transferring pkgs to a driver they sent to help me. I had sent the sup pictures of my load (one of those days where the cargo and bulkhead doors were jammed until the bulk came off). I just smiled and reminded him of those photos and that I had asked for business help. Giving away my 8000 shelf would have been useless, and given the way the route is dispatched (lots of businesses tossed in with resis on the back half), I had to sort the truck to ensure I got the help I requested. All he could say was, "it seems like you could've done it more quickly." Okay boss, anything else, or may I go ahead and verify my air?
As for taking breaks as a low seniority cover driver, e.g., working as assigned, not bidding coverage. Let's say I know the route is an s-show, e.g., most days the only way a driver will take lunch before 5p is by running-gunning or getting business/pickup help. Or by breaking trace several times and by-passing so many odd resis that doubling back for them will make it a 14 hr day. I don't run and gun and I know our breaks (and the nine five list) are the best leverage we have against over-dispatching. But when I don't know if I'll be on the route tomorrow, I admit, I usually don't invest the painful effort to try to improve it. I have no idea whether I'll get the chance to see it through anyway. While I'm comfortable working after dark -- at least in areas I know -- I still prefer and feel safer working in the daylight.