Once you have completed 30 reps at the first weight (35/20) you reload the bar to the next weight (62/35). Once you have completed 30 reps at that weight you reload the bar to the next weight (45/75) and complete 30 reps. If there is still time left reload the bar to the next weight (95/55) and complete as many reps as possible until 10mins is up. During the unloading and reloading of the bar the clock does not stop. Each person will load their own weights unassisted. Only 1 bar may be used, you cannot set up multiple bars for the workout. If you are unable to Snatch heavier than the first weight (35/20) but you get 30 reps then you score is 30. Even if you only get 1 rep at that weight you still have a score of 1 to enter on the Games website, which will keep you on the leader board!
If all this is very confusing don't worry, the WOD will be explained in detail tomorrow.