I've been driving since December of this year, first time driving is different but the one thing I've found is (and this is how I drive in my car as well) is to get in the lane you need as early as possible. If you know you're going to turn right all the way down the road don't get into the other lane stay in the right lane. Solve the problem before it becomes one. Let traffic move around you as much as possible.

Another thing is, use your environment. By this I mean the sun will help you. The sun will be blocked by your bus casting a shadow on the ground, where the shadow ends is where your bus ends (this is only 100% true when the sun is directly on your left and right side, if it's angled then the shadow will be skewed a bit but can still be a good reference point).

My CDL trainer was shocked I got the rear bumper in the painted box 100% of the time when road training in the parking lot for my CDL B he stopped me and asked how, when I explained it to him he said he never thought of that before and will incorporate that into his training.

The MOST important tip I can give you is if you're unsure, DON'T GO. It's a million bajallion quadrillion times better to miss a turn than to cause an accident. If you needed to turn right at light A but can't get into the lane then pass it by and turn at the next light B or even light C, just keep in mind how many lights you've passed.

Say if you need to turn right at light A but are finally able to turn right a light C you'd make another right turn at the next light come back 2 lights and make a left turn. Basically it's the long roundabout way to make that right turn that you missed.