In my opinion,
Set priorities. You will NOT have time to do everything. No matter how fast you run, you can't brush every mouth, change, reposition, get vitals, make beds, feed, dress & undress & dress again!, shower, toilet, toilet, toilet, transfer, bring to activities, catch someone from falling, redirect a confused resident, .........you just can't do it all, all the time! Keep in mind, when a CNA says at the end of their shift that they got it all done, they mean, everyone is clean and fed and nobody got hurt!
Get organized! The best way to do that right off the bat, before you learn about your residents and their routines, is to stuff your pockets with as many supplies as will fit. Trash bags, A&D ointment, denture tablets, etc.
Take 5 minutes or less at the start of the shift stocking the rooms with things you need. Towels, briefs, soaps, etc. to save you trips down the hall later. Every minute is valuable and little tasks like running to get trash bags adds up and costs you.
Get ahead if you can and NEVER save something to do later if you can get it done now....things happen and in a blink of an eye you are behind.
Most importantly: go easy on yourself. You will be overwhelmed & frustrated. You will feel incompetent & lost. It's likely that at least one of your co workers will be rude, unsupportive and impatient with you. They forget what it's like to have to learn a new routine and to get the hang of things.
Give yourself a good month to get a routine down and a good flow going. It's a tough job!!! It's hard work. You can do it if you look for the good instead of the negative.