The disclaimer is there because, while I tried my best to make sure all info in the guide is accurate, I don't think it's fair or necessary for me to take on legal liability if someone makes (or claims to make) a mistake by using this (free) guide. I certainly hope readers do not interpret this guide as a definitive and comprehensive substitute for proper legal counsel and research of their own--rather, it contains information which is designed to act as a supplement to those things.
In other words, it will hopefully help folks avoid false negatives in legal steps (i.e. forgot to file an 83b within 30 days or register with their city's business department), expose them to lesser-known alternatives that their own lawyers may not have told them about (using FF preferred stock to provide a small measure of founder liquidity down the road without skewing 409A valuations), and understand why it's necessary to do certain things (like adopt bylaws, file a Form D, etc).
The scope of the guide is strongly biased towards U.S. startups incorporating as a Delaware corp (a common approach, even for companies not based in Delaware itself).
It wouldn't bother me if you were simply sharing your experience in setting up a company, but this article is presented as advice wrapped in a thinly-veiled promotion of your product (and some lawyers/law firms).
Anyhow, it looks like most of the sample documents attached to that spreadsheet are from Orrick's tech group:
https://www.orrick.com/Practices/Emerging-Companies/Pages/St...
Under the section for "When should I use a lawyer", I added the below (I also introduced "Finding a lawyer" as the first step of the Delaware corp checklist tab): Though the formation documents are sometimes similar, mistakes can be made easily and are often costly (or impossible) to later remedy. I strongly recommend consulting with a startup attorney to provide guidance throughout the process and review important documents before you finalize them, even if you wish to file most of the incorporation paperwork yourself to reduce legal costs. Many startup lawyers will even do the basic incorporation for free of labor charge (passing through only the filing fees directly to you) in the interest of gaining your business as a long-term client down the road. Other lawyers will also/alternatively allow you to defer payment for legal work (up to a certain maximum, sometimes as high as the $10k range) until you've raised funding.
See here for a horror story involving DIY incorporation: http://bit.ly/incorporatinghorrorstory And the corresponding HN thread from 5 years ago: https://news.ycombinator.com/item?id=2399139 (I had to use a bit.ly link=>web archive because it seems the original link is now dead).