Check out my website! http://www.dreamweddingdiy.com/ Have lots of fun DIY videos.
I'm struggling with this as well, as I'm trying to save money by doing things on my own. I've found that the seating plan software from AllSeated has been great. Essentially, it's a seating chart maker for mapping out where everyone will go. It's easy and free, and it's helped me a ton. It's nice because you can upload the specific vendor events layout for your wedding as well. Just thought I'd share! Definitely look into it :)
Click on each tool to see a sample.