I've made tamales from scratch a couple times. Yes it is a lot of work but I wasn't feeding a big crowd at once, what I did was assemble them, placing about 8 on a 13x9 pan and freezing them, then doing another 8. By the time I had the 2nd batch of 8 made I would bag the first batch in a heavy zippered freezer bag and repeat that cycle until I had them all done. If I was having company I'd get out my 12 qt. stock pot and place a metal steamer insert in the bottom and steam my tamales about 45 minutes. If I was just doing them for myself I would use a 4 qt pan and use the same (expandable) steamer insert and steam them for 45 minutes. With some refried beans, rice and a crisp salad it was WONDERFUL...
Ok now I gotta make tamales. I just used the recipe on the side of the masa bag, it worked great - think I used a pork butt for my meat. Love me my tamales.