Thx. Your video is useful and informative. In Australia, the construction supplier is Bundies. They have experts in different fields who can hold regular sessions to provide expertise. For me, I took a 4-month course in Construction Institute HK on maintenance. It focused on things that you suggested. Ppl need to know for every job, there are different options, tricks and tools. B4 embarking on any project, make sure u research on how to do it, and have a Plan B (someone with experience to call) in case the project fails.