So fire up your players, dust off your sets and fire away, this should be a lot of fun.
For me personally, the thing that I was struck by when revisiting 'Welcome to the Hellmouth' and 'The Harvest' was simply that this was the beginning, the formation of the Scooby gang, the development of the group dynamic that would eventually form one of the most enjoyable ensembles in recent television memory.
Buffy, Willow, Xander and Giles all found themselves in Sunnydale and it almost seemed as if they were destined to meet and fight world-threatening evil together from the moment they encountered one another. It was also cool, since I know the outcome from all of this, seeing how the characters grew up and changed over the years, Willow found self confidence, Giles lightened up quite a bit and became a father figure in Buffy's life and Xander proved more than a few times that he isn't just the 'Zeppo' of the group.
But it's Buffy that held them all together through all the tough times, she went from being a reluctant hero who was in love with a certain brooding, not to mention toothy, charmer named Angel to a strong willed and confident young woman who empowered almost everyone she met with her charm, wit and strength of character, she embraced her calling as 'The Chosen One' and proved to be the best of them all. It's fitting, I think, that this formerly average valley girl (pre-calling) would emerge as the world's saviour, whether it be from the Master, Glory, Adam, the Trio or
And saved millions of tv viewers from bordem every week in the process.
I was also struck by how much better the FX got in the show, including the make-up for the vamps and the show's trademark "dusting" effect. The production values starting out weren't as great as they later became but this only adds to the effectiveness of those early eps which were appropriately dark and ominous, the sunny skies and pleasant streets of Sunnydale that hid the darkness beneath which we soon find out is a gateway to hell itself.
I'll stop now, I could type all night, but i'll let you guy's take it from here.