0% for 21 month credit card as backup to get started?

[Eric P.]

Wife and I want to make 2017 the year we jump in.  Too much analysis paralysis.  Our thoughts are to start with a property around $100k.  Approved for a 15% down loan with an online lender.  We'd want 6 months of bills as emergency backup, 4% for closing costs, and 5% for surprises/repairs.   On a $100k house that would require about $25k-$30k.

My father is a handy man so most easy repairs or updating we can handle ourselves cheap, but I'm wondering if its worth opening one of those 0% interest credit cards for 21 months as soon as the purchase is complete.  Just in case there is a real big surprise.  We have about $25k now and I'd like to really get the ball rolling.. Should we put it off for 3-5 months until we're at $30k or is it okay to get going now?

I plan on opening a new bank account and credit card away from our personal accounts to keep track of spending come tax time anyway.

(We keep 6 months cash emergency fund for our personal home and expenses we don't touch)