There's a fairly simple solution, if you were playing on a siblings\significant other\friends account, just ask them to buy or hold onto some cheap low level yellow gear with decent stats and +xp create a new character of the same type and powerlevel.
Once you know what your doing you can rush through remarkably fast especially if your using same level yellow gear (keep in mind that the first time you fight the skeleton king he tends to drop lvl 5ish rare(s) when you are likely around lvl 10, and this level gap between what you obtain from bosses and the level you usually are to beat them tends to widen as you progress through the game. Using gear that is close to your level, or socketed with flawless square gems will make it incredibly quick to level the new character up, its not impossible to do the speed run achievements on your first play through if you want if you skip all the cutscenes and conversations and just rush through, relying on the +exp to keep your level to where it should be.
Once you reach the level you were in the first place, just have your sibling\significant other\friend trade you the items the old character was wearing.
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