My a1 build, just did it today without troublehttp://us.battle.net/d3/en/calculator/demon-hunter#aZXTlV!TYe!abZZab
Around 14k dps and 22k hp, 120ish all resists, no sharpshooter included in dps. I had 3 pieces of gear with +disc on it, mainhand, quiver, and cloak. my disc is 57 and I can tank atleast 1 hit from anything in act 1, if i take a hit i use SS and semi stutter step away, drink a pot and then use SS preemptively to avoid damage until you are low enough in disc to want to use prep, the CD for potion is coming back, or there are health globes around.
what part of spider queen is difficult? The minions go down in 5 hits at most, just keep distance, if she runs up to you SS away or chain a few SS and go all DPS if you think you can get her low enough to get minions out again, by kiting and using SS you should be able to get her to the add phases without any problem. If not, maybe you need to upgrade your weapon/damage.. you could switch to impale with +100% crit dmg or the chemical burn one if your crit is bad. I recommend using the same build for the whole act though so you can find lots of rares from bosses(nephalem buff)
the butcher is tough, I'd recommend wearing enough hp to take a hit from the conal chain thing. For me it was 24k, i don't know the reduction I had though. After that it's all about the kiting and avoiding the fire, a bit of luck is useful for that part. Same as spider queen, try not to drop nephalem buff but if you need to I'd recommend impale again. I tried for 15 minutes with dex setup and was getting 1 shotted by the conal attack, regemmed all vitality and was able to survive it with about 2% hp remaining.. it was enough to get to the healing wells and use pots before the next time he used it. Had to burn most SS just for movement and not avoiding attacks
edit: I used a 1h xbow and a quiver