Halfway through the EAA sheetmetal class over at lakeland.
Well worth it to get my hands working again before I damage a part that I had already invested significant time in because I had gotten rusty. Actually learned to use the gun and buck myself. (Had pretty much restricted myself to either bucking or driving but not doing both simultaneously.) Even if you are familiar with the process, its a strong confidence builder and worth it.
Gets you a discount on Aircraft Spruce. So cost wise hopefully its a wash.... But confidence wise. Priceless.