You can't use Sparrow for mixing coins until you run your own node and connect it with Samourai, that is not exactly user friendly for most newbies.
It's not difficult, just time consuming to let your node sync for the first time. If your node and Sparrow are on the same device, then Sparrow will connect to your node with a couple of clicks, and connecting to the Whirlpool coordinator via Tor is a simple as having Tor running in the background and Sparrow does the rest.
If you are serious about your privacy, then you should be running your own node anyway. There's not much point coinjoining if you are then going to link all your coins together again by relying on an Electrum server (for example) which is run by the NSA.