Hi Sanise,
I've been investing in Real Estate for a few years now and am actually doing this for the first time right now. I know it's kind of backwards to invest in properties than further down the line "house hack" but that's just how circumstances played out for me with my current home.
As far as I am aware (and I'm not a lawyer) you'd be in default on most mortgages if you went in as a primary residence, then converted to investment property. If you continue to pay your mortgage on time and there's no issues, it most likely wouldn't be an issue, but it is a risk factor to keep in mind. I guess that would be the main con, that and the lack of liability protection you get from owning it in an LLC.
The pros are that it would no longer show up on your personal credit and debt to income calculations for other credit purposes. Lending parameters aren't as good, but in this environment there are still attractive options available. Banks are a little overloaded with refinance requests from my experience (mostly working in NY, NJ, PA) so without previous relationships it may take a little while. Just try and be patient.