Default wifi hotspot

Ask me about photography, no prob. Here I'm not too sure of myself. Have a Samsung S4 and just got a Nexus 7 2013. Can't afford another $20 for the 5GB plan and read that I can create a WiFi hotspot within the AT&T 3GB by doing the dance you guys know better than me. All I really want to know is whether I can damage the tablet.

It looks like the youtube vids are pretty clear.

Thanks very much, Ken