Before the hunting starts, ask them what kind of trophy they are looking for. If their expectations are unrealistic, I would help them reset......(in this case since you are new to the area, I'm not sure how much info/trail cam pics, etc. you will have).
Before the hunting starts, ask your client how far they are capable of shooting. You don't want to get within 500 yards of a shooter thinking it's game on, and then have the client tell you they don't feel comfortable shooting past 300.
Be sure not to get too far ahead of them when hiking. Stop if you do, and when they catch up to you, let them rest for a couple of minutes, even though you were resting while waiting on them to catch up.
Something to keep in mind....your client will remember this hunt, and their experience with you, for the rest of their lives, for better or for worse. Getting the animal at the end is great, but make sure everyone (including you) is having fun during the whole process. And when I say having fun I'm not talking about entertaining anyone, I'm talking about attitude.
I'm sure you will do an exceptional job. Coming here and asking this question shows your humility and thoughtfulness.
Good hunting!!