There have been may time I walk on a potential customers site and look at their network and see a rats nest of wires, switches AP’s etc…
Don’t think about it too deeply. Either a client will have information or they won’t. Either way propels the need for you and your services. Don’t take it personally or make it emotional. That will keep you in a better mind frame in the long run.
Even though there is a chance you can go out of business as much as your client and other companies as well, the thought of having your data portable so that in the event someone wants to lift and shift they can relatively painless is honestly the best way to go. No one wants to be chained down when paying for something.
Honestly, you can scan the web you will find infinite templates. Even in this community as well. I always suggest you taking some paper out and writing down what is important to you. What is required to be documented? What is good to document? What is something you’d like to document? Don’t worry too much about the style of the document, the font sizes, spacing, etc those are distractions.
Once you have your own “template”, consider who will be using the document. Is it staff, onsite support, the customer etc. Then consider what would be an easy way for each party to view it. Bam you just made documentation.
Obviously Tom has made a video series about his tools and he prefers to use MediaWiki. If you think about it, it “ticks” all the points I made comfortably. My “tools” and “templates” changed over years. I started out with my iPhone Notes, Base Camp, Asana, Word templates downloaded free over the web, templates from user community in Spiceworks, finding open source templates, vendor templates, came back to my iPhone and used different apps, the actual Spiceworks app and add-ons. The list keeps going on and on. I’ve very much seen word docs, spreadsheets, or google docs and spreadsheets. At some level, they all accomplish the same things it just depends on how you want to facilitate the process. I mainly worked on a 1 man team and at my best, it’s been a 4 man team. That’s while working in the non-profit sector.
Currently I use a web and phone app called Nuclino that allows me to use the web or my phone or tablet to document. I prefer the ability to reduce the chances of me wasting time with font styling etc, and spacing of items to have full control of how each line works and if I want to export it can do all the normal ones like pdf etc. If I ever needed clients to “view” it I could do that, but most clients I deal with are old companies and unlikely to change, so emailing them and letting them print is just fine for them.
I actually liked the idea Tom had (and I sure many other IT pros did) which was use open source to kinda take the wheel. I love IT Glue and basically have mimicked some of their ideas along with my own. Accomplished the same thing minus automation.