solo mostly, just buy gears from ah with the money from blue item sales and its pretty much safe,
only dangers are boss fights that has some sort of time limit like butcher and belial which can be solved by over-level your character and red gems in higher level weapons.
get a red gems into a helm will make leveling pretty fast.
i will come help if you want safe passage to those bosses in hell.
a piece of advice is that on your first hc toon, create 2 hardcore mule to store your levelup gears, your toon will eventually die and those levelup gear will be great help.

Added on December 26, 2012, 2:55 pmoh and dont forget to use the SV passive.. it makes wd pretty much invincible if you dont push it too hard.
my first wd died because i didnt use that passive.. sigh.
Added on December 26, 2012, 3:53 pmoh and once u reach level 50+ (hell), just buy a -lvl req weapon from the ah and u own hell. so u probably wont need my help... but will come if u need help la..
This post has been edited by Boonie: Dec 26 2012, 03:53 PM