You’re going to get hijacked. This happens when you are inserted into a lazy crew who won’t do their job. You’ll be judged on their performance but they won’t appreciate you working harder to pick up the slack. Either they’ll leave you to it, or make the job harder. You can only give certain hints that you’ve been working. Are you covered in sweat and dirt and the others clean and fresh? Hopefully your boss will be able to work this one out himself.
You never, never, dob in your workmates. No matter what kind of arseholes they are. Karma will get them eventually. People are always found out for what they truly are in the end. If that’s not good enough for you, too bad. Getting a name as a dobber will ruin your life and, quite frankly, you’ll deserve it. It’s better to rise above any problems until the end of the job. If it’s a temporary position, what does it matter in the long run? If you’re there for a while, take the first opportunity to be transferred to a decent crew. If it all becomes too much, fucking leave and find something better.
Working with a tight knit team is great. They go hard when it matters and know when to back off when it doesn’t. They will be less likely to score the shit work and the boss will trust them to use their initiative and have more leeway. The bosses are less likely to ride them. A good crew will have a drive and motivation that probably extends to their private lives making them more interesting to talk to as well.
Do your job properly, no matter what crap task you get. Word filters up eventually that you can be trusted and are pulling your weight. Your good name is a large part of what you have to trade with. Don't let your name equate to moron status.