Marinate everything, THEN, put them on the skewers. That's what I do.
Took this to a get together last night. was GREAT and all were eaten. Easy, easy to prepare and yummy to eat. You do have to pre-plan because of the amount of time for marinating for 8 hrs. Only issue I had was the skewers poked through the baggies used to marinate the skewers. I had made more skewers than the recipe called for, so they did not all lay in a neat little row but were instead on top of each other. I put the baggie in an pan and so there was no mess in the fridge while marinating, and turned the bag a few times during the 8 hrs of marinating...so it would distribute throughout. (I had wondered if the wooden skewers would be oily to hold on to, but they weren't. It was GREAT !) Would definitely make this again !!