You can! Just go to your local community college or vocational/technical school and take a course in Welding.
I learned on the job and it's a skill that I love to tinker with on projects like this. I've built a truck rack to haul my boats with and many other cool projects.
Get yourself a MIG and some flux-core wire and some scrap metal and go to YouTube and watch a few intructional video's and you'll be on your way. Just don't weld anything structurally critical until you've gotten a thorough grasp of the basics, etc. Have an experienced Welder guide you and critique and all is good.