I pretty much look at the mini-map 90% of the time and double tapping 11,22,33 to switch the screens between my heroes. (ex: I see at least two enemies near to Olaf, tap 11 then right click him back to the fountain with Z mount, then double tap back to my other viks to see how they're doing in their lanes) When my viks are together, as they should be later in the game for teamfights, I simply left click on them to micro around. But playing viks really comes with a lot of practice and a lot of good map awareness, so I'd say a good habit would be to try to keep your eyes locked on the mini map at all times and double tapping on the numbers to scroll through your viks quickly. If you can master that, then you can make playing viks look like a piece of cake :-).