Building a home addition, hire a GC or hire subs myself?

[Travis Lee]

Hello and thank you in advance,

New to the website! I recently purchased a house where I plan on adding a home addition. This is my first time building a new structure so I asked a GC to help. The request for the GC was to build the structure (roughly 500 sq ft), or "dry in" the space - then I would take it from there and hire my own subs for the mechanical. The bid I'm getting to dry in the space is far more expensive than I anticipated. I'm currently in the process of getting more bids but if they are in the same ball park it looks like I may lose money on the project. 

At this point, I'm considering taking on the "dry in" portion myself by hiring subs to complete the foundation, framing, roof, etc. For me, this isn't a question of if it's worth it or not because I recently left my 9 to 5 to pursue this full time... so I have the time to work on it and the rest of my capital is tied up. The real question is if this is do-able. I'm admittedly not a professional builder but eager to learn. Also, I've had some trouble in my very brief research on how to find a good foundation company, framing, etc. so this part worries me too.

Any advice is appreciated!