What should I be aware of if I’m considering guest blogging?
There's been lots of discussion about guest blogging after Matt Cutts blogged about it in his blog entry titled "The decay and fall of guest blogging for SEO". Matt Cutts: Gadgets, Google, and SEO, on January 20th, 2014 titled, kind of dramatical, don't you think?
In essence, what Matt seems to be saying is that since guest blogging has been so heavily abused for the sole purposes of building back links to the point of sacrificing quality, that the practice is now looked down on and will no longer be given the same value as it once did. That seems to be a piss-poor excuse for complacency, so that's what it looks like to the passerby.
As Matt recommended, I wouldn't count on guest blogging as your sole link building strategy, unless you're in high demand and can stake claim to an impressive Klout score.