How to Approach a Potential Subject To Deal

Hello everyone,  I am new to real estate investing and am super excited to hunt for my first deal.  I am learning about subject to deals and want to start here as a way of finding my first deal.  What my aim is right now is to get a list of NODs in my area from the city and then go and knock on their doors.  Has anyone done this?  What my question is, for those of you who have done this is, how should I approach the home owner?  Should I knock on their door and just be upfront about what I'm doing and say something like "Hey Mr./Mrs. Homeowner I am an investor looking to help people in tough situations and have found that you've received a Notice of Default on your property and am wanting to give you some options to help you?" 

Or should I ease my way into the conversation and just say something like "Hey I'm an investor and am wondering if you are planning to sell your home anytime soon?"

I really just want to get a good idea on how to approach a homeowner and the right things to say to make them feel comfortable and so that I can get my foot in the door.

My goal is find a home that I can structure into a subject to deal and fix, flip and sell right away.

I appreciate any feedback I can get!  Thanks!