Use "Watch this" to "mark" item(s) of interest so you can watch the bidding proceedings, before placing a bid.
In the Lot Page of an item of interest, just above the "Description" tab, you can click on "Watch this" beside the Binoculars icon to add this item to your watch list.
By keeping track of the bidding proceedings you can place your bid when you are ready, watching multiple items using this feature. You can bid from the watch list or click on the item and bid from the lot page.
You can "Unwatch" an item at any time.