Hi @Lou ,
As stated, the wiki is the best advice and tool you can get… it may be overwhelming at first, but with time, it will naturally make sense. When you need to perform some task and have doubts, you can rely on the user in the forum support.
Learn the printer parts’ terminology (Bambu Lab Printer Hardware Glossary) and how to perform maintenance(Bambu Lab X1 Maintenance Recommendation | Bambu Lab Wiki). The first will help you search and communicate with others when necessary; the last, you must do it.
Safety, as you have when using home appliances, maybe a challenge. At a certain point, you may be forced to do some tasks that entail risk; however, you can reduce the risk to a minimum with knowledge. Take your time, and don’t rush it. In doubt, ask before doing it.
I can tell you that the issue you describe is minimal, but I understand your concern… I had the same feeling years ago.
The good thing is that if you treat it correctly, the problems tend to be rare.
When exploring the wiki, you will notice that you need some tools to facilitate the work. If you don’t, it is time to acquire. Nowadays, you can get good quality tools for a fair price. Just don’t buy one that starts 3D printing kits with a massive number of tools. First, they tend to be bad quality, and a regular user doesn’t need all that equipment.
Spares were already mentioned. I also believe it would be helpful to have consumables and a few spare parts at hand. Even if in warranty, you don’t want to be with the printer stopped. You don’t need to buy everything, and not all at once. Take advantage of promotion periods.
Concerning the specific questions:
Depends on what you’re dealing with and at what phase of the printing. E.g. pausing the print will move the extruder to the poop chute zone, making it hard to do any intervention in the extruder and hotend.
Not all the tasks need to be performed with the printer hot. So, in that case, you let the printer cool down and unplug the power cable.
If working with a printer hot, you need to be aware of the hotter zones and, if possible, work with gloves. Be aware of the electronic components running to protect you and the printer, and study the procedure to be carried out so you can be confident when in practice.
If your filament is already calibrated, you don’t need (nor should) calibrate at the beginning of a print. Bed levelling info is stored in the printer temperature memory, so you need to do it when it is lost (e.g. power cycle) or if you notice it isn’t producing good results or byt precaution when you a long print.
Moving the printer may affect the bed levelling.
In that case, my advice is to recalibrate the printer.
(Although the printer seems to “move itself” around a bit with all the vibration… I do have the vibration absorber things Bambu sells under it to keep the noise down.)
I also had BL vibration isolation feet, yet I opt for what I believe to be the best solution for dealing with vibrations: Simple 3D printer noise reduction with a concrete paver — CNC Kitchen.
It doesn’t need to be identical, but it should follow the concept of Foram (mine is from a sports mat) at the bottom and a heavy plate (I use some marble) between the foam and the printer.
Last but not least., enjoy the printer.