E-tickets are very easy to buy at home. Business Travelers can buy them online and get the printout at the airport. Not so easy in practice. It's a jungle in there.
The first time you use automatic check-in at the airport it seems like no one is in charge, and everyone knows what to do except you. How to get savvy with the process of checking your bags and getting your boarding pass.
Note that different airlines and even airports will have differing steps in this check-in process, so use these tips as a guideline, not the gospel:
You're not done yet. You still need to mill around with everyone else and wait for your name to be called. Once called, step forward for more instructions:
That's it. It goes a lot smoother once you've done it once or twice. The next step is making it past security. Since all these sometimes awkward steps are to ensure easier and safer plane travel in our post 911 world, it's hard to complain about learning new tricks.