Advice:
Pay special attention to the time a project is due and use that to your advantage. If they can wait until 9AM the next day, don't stay up until 3AM finishing the report.
Make friends with the schedulers. Don't be afraid to ask for extensions so you don't stay up til 3AM. ...I had a $95 targeted apartment shop. Without divulging too much; there were like six targets at the complex. Instead of doing the whole russian roulette thing where you need to talk to Dick and Jane answers and you have to call back, I asked the scheduler if it is possible to just take the shop for Dick and if Jane answers, have them switch me to the targeted shop for Jane? It was. So with one call, I hit my target, had a great shop with a leasing agent who actually knew how to sell, and everyone was happy. There are far more stories of how a great relationship with the schedulers is for your benefit than that one. Absolutely crucial if you're planning a route.
If you have 3 days off on a weekend or whenever, I find it more satisfying to schedule my shops on one or two of those days and use the 3rd day to just rest. Don't over-extend yourself. Half the battle is showing up; showering, getting dressed, driving there etc... Its easier to get 4 shops done in one day than 2 one day and 2 the next in my view. When you get home and type out the reports, you get a rhythm going. I scan all my receipts at once, air-drop all of my photos at once, and after all of the folders on my desktop are ready, I then brew some coffee or air fry some chicken strips, open the report and uploading the files is a breeze.
Wait for bonuses BUT do what makes sense to you. I had a $60 apartment shop the other day. Literally across the street was a Sonic that was still offering introductory fees. I took it. Easy $9. Nearly zero gas spent getting there. Had I waited a week or two, maybe the apartment shop would be offering $80 and maybe the Sonic would be offering $16.... but $69 in the hand beats $96 worth of "what if's)' Now, if the apartment was still offering $25 (introductory rates), I wouldn't have done the Sonic. My target is to make about $500 a month mystery shopping. That bridges the gap between the income at my "real job" and my expenses and then some.
I almost always record all interactions using my voice memo on the phone. Not so much for the narrative but for timing purposes. Its better if you can use an old cell phone you no longer use.
If your assignment has you taking pictures, take 2 or 3 more of each assigned target. You may not have noticed that bird flying in front of the gas prices on the sign but your scheduler would.
Stay out of Southeast Texas. (My territory).