DIY Moving

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Since we're talking about moving this month and we heard from so many of you with tips on local movers, I had another question. I helped a friend move this weekend (I was there for the 'extra' stuff, all the big things had already been moved, phew) and I realized that I have only ever hired movers when we've moved the office. Personally I have always had friends willing to help (and someone with a truck). How many of you do the moving yourselves? And what do you consider to be the proper etiquette for saying thank you to those friends willing to help?

-Laure