I would talk to a loan officer to evaluate your current mortgage and financing structure. There might be benefit to taking a cashout mortgage rather than a home equity depending on your current rate, balance, equity position, tax bracket, etc. A consultation is of no cost or obligation.
Thats my opinion, I hope it helps.
Any good loan officer is likely to have a similar relationship with an appraiser. Contact a loan officer you trust and see if they can ask an appraiser for an opinion of value.
You really should speak with your lender on this one! Sometimes a line of credit can be done without an appraisal but it depends on many factors. You need to check the various programs your bank or lender provide. If you have owned the home for two years it is likely that you have not gathered much in the form of equity and appreciation so it would be best to find out what your lender thinks. And go from there.