ah yeah on the serious side that's basically it ^ Along with playing guitar and other instruments, i play drums in a band, double kicking a single pedal gives a double bass effect but for obvious reasons is harder and not as versatile, although more respected by professionals.
Double bass is something you just have to master, root got the technique there ^ and seriously, it's just a matter of getting your legs pumped so you can hammer out double bass all day long. My advice is find a pro who can show you the technique briefly just so you know where you're going.
Good luck, Let me know how you get on!