There isn't more to it than what is written in the manual.
You should save your config.php, because it contains all the information on your installation.
First I would make a backup of all the installations (comfort update create a backup for you before starting) and I would also secure everything that you modified (templates, etc.). They usually stay in the installation, but it is better being save than sorry.
Comfortupdate really is simple and easy and makes the update process a lot nicer (you probably will update more frequently). But it is not necessary. Manual update takes probably slightly longer, as you need to download the whole package, extract it and then upload it to the server via FTP. Depending on the connection this can take a little bit, because there are many small files, which takes a while. but besides that, it is not a big deal.
Your versions are all not too old, so updating should be quite straight forward.
If you go for a manual update, or go for the (now paid) comfort update is your decision. If you plan on using LS regulary and want to keep the 3 installations, then I probably would invest the money in the comfort update. Because it is usually just a few clicks in the interface and the update including backup, etc. is done. Chances that you keep your installation up to date are a lot higher, I'd say.
But if you don't want to invest the money, updating the installations might take you 15-20 min per installation (might be more, might be less depending on your skills, connection, etc). Most of it is waiting to upload files via FTP anyway. So not much of a big deal.
Start with the least important installation. If something goes wrong (but I don't see why this should happen if you follow the instructions) it is the least important install.
But you can contact users like Mazi or Dennis. I think they offer services around LS installation/updates and can check with them to do it for you.
Help us to help you!
- Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
- Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
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