I think it is still staged at fairgrounds on Washington side, upwind, so you just drive there, get in your boat, paddle downwind, then a shuttle takes you and your boat back to fairgrounds. Easy. You can also leave your boat at fairgrounds overnight, for the week. Ask around once there for a group to paddle with. Or hang out at water entry point looking for what you perceive to be similarly experienced paddlers and ask if you can join them. Most paddlers are friendly. As I recall, that section is less about sides vs middle, but yes, you can always stay near the sides of the river for less wave action, but I do not think you will need to on that section. Now, the sections well after the shuttle bus pickup, past Viento (where shuttle used to take you to the top, and part of actual race) can get big on middle and left near Hood River, especially "swell city" so staying on right is best for first timer. If you feel confident in the practice runs, I would do the full race as it is super fun--and why you are there, unless maybe wind kicks way up on raceday. You will enjoy the experience.
KR McGregor Rhythm, V10Sport, Swordfish S, Fenn Tarpon S, Fenn XT, Twogood Chalupski, Findeisen Stinger spec. Had: V12, Stellar SE, Huki S1-X, Burton wedge2, Fenn Tarpon