NO worry. Just relaxed.
Driving is easier in USA than in Singapore.
Most of their road is straight and wider. American are friendly driver. When you signed, they will give way. They will give way to pedestrain when you are on the road. It is compulsory under american drive rules. Stay in the car when the police stop you. Wait for him to come to you.
City like SF, LV, LA are a bit tense as there are more cars and lots of traffic lights. You would rather take their subway (trains) than to drive. In SF, you can park your car at the outskirt and take BART. In LA, Metro. In LV, monorail and mainly walking. Along strip (main street in LV) you will definitely stop at every traffic lights you meet. Hence I hate driving in city.
We din have a proper map since we travel through 4 states. Our best friend are Gas stations (petrol kisok), hotels and visitor centres. We get informations, maps from the staffs there. They are very precise in terms of directions and the travelling hours.
Since you and your hb is petrified to long distance driving, I would suggest you take flight for LV to SF or vice versa. That'll be the longest and time-consuming road (abt 10 hrs drive, we travel through nights.)
Driving is exciting cos you are able to see things along the way. We saw coyote, deers, rabbit, etc. You'll know where are the nice town to stop from the ppl you met along the way. Flying take you to your destination faster, but you don't see much along the way.
And if you have time, read through SB archives. Ppl in this forum are very helpful and the informations are reliable. I gathered info from ppl like KrispyKreme, Ginn, Kean, Och, etc.
I flew to SF, drive from SF,Yosemite NP, Zion NP, LV, Bryce NP, SCB, Page, GC, LV, LA, Santa babara, Solvang, Montrery, SFO. 20days duration.