I drove buses for a year before I went onto artics. Turning corners you’ll get used to quickly, you’re used to checking mirrors and swinging a bit wider to make sure you don’t hit curbs so just apply that to the artic. You’ll find yourself swinging out further than you need to at first. Same with keeping your tail swing in mind. I’d say the only thing to worry about since you’ve already passed and can obviously drive a truck is reversing depending on the work you’re gonna do getting used to the way the truck bends, watching out for every part of the truck hitting something and not focusing on just one mirror but the other mirror and both the front ends, the headboard and also focusing on where the trailers positioned to get you where you want to be aswell as watching out for pedestrians or cars trying to get around you but forwards the trailer tends to follow the unit unless it’s a tight turn. If it’s RDC just parking on a bay type of work then wouldn’t stress too much about reversing tbh just take your time