Research and plan
Do some research in advance. You’ll need money for car parks perhaps. If you’re in a minibus and have a driver, will they drop you off and pick up at the same location. What’s the weather planned to do etc.
Planning will be 60% of the effort to ensure it’s safe and successful. There’s a plethora of information out there including things like Facebook forums.
If you’re worried, consider getting a mountain Guide who’ll help and support.
Food and water
Think carefully about food and water. Have some bits in the vehicle to top up when you’re on the move and don’t disregard the energy requirements on the mountain.
Take food and water with you (pending your personal needs) and drink/snack little and often. Don’t skimp on this.
Rest while travelling
Rest while you’re travelling. Yeah, this is easier said than done!
I may even take a blanket and pillow with me to get the best rest I can along with earphones or even ear plugs.
I’ll make sure my personal space in the vehicle is as clean and tidy as possible. If the weather is bad in the mountains I won’t compromise my personal space by making it wet and dirty. I’ll change in to dry warm kit and then get comfortable.