Golden Hammers are something I will never use. I won't feel nearly as good if I don't complete all the challenges by myself, and I have only about 10 more to go. I'll feel much better when I can say, "I beat all the challenges without using Golden Hammers." Challenges are meant to be done, and be a challenge (hence the name), not to be skipped.
Why would you need Hammers, anyway? All the challenges are easy, some of them just take a lot of playing, which you will definitely achieve over the years. Just think about all the time you spent in Melee. And if you're really that desperate to complete all challenges soon, there are usually quick ways. Watch dphanna's KO factory on youtube for the KO's. You can also leave your Wii on during a match for a few days for the time based challenges, on a stage with no hazards with a few controllers plugged in. Also look up dphanna's CD factory on youtube for all the stickers. Play coin launcher for trophies, and do all the challenges that give you trophies. And if you can't beat Boss Battles on Intense, rofl, keep practicing, learn the boss's patterns, and get better.. I beat it with Metaknight on my third try, so it's really not that hard. In fact, there is someone on youtube who beat boss battles on intense with every character.