I'm glad you brought up your grandfathers. Both of mine led very difficult lives and made great sacrifices so that their children and grandchildren could have a better chance than they did. Whenever I have doubts about my project (which isn't often), I remind myself that they came here so that I could do this. Kinda puts things in perspective.
I'm with you on the grandfathers too... It makes me proud to think of all the ancestry behind me - behind everyone really. All the people who have worked so hard to get us and the rest of humanity to this magical time.
Sometimes when I'm feeling down, I watch this little clip on youtube - I don't have an ounce of Viking ancestry, but I like the message:
http://www.youtube.com/watch?v=RN-no1Ka7yU
Lo, there do I see my father.
Lo, there do I see my mother.
And my sister and my brother
Lo, there do I see the line of my people
Back to the beginning.
Lo, they do call to me.
They bid me take my place among them
In the halls of Valhalla
Where the brave may live forever.