I truly have not had any problems with this fire table. The few issues I’ve did have were with the thermocoupler (the nipple thing next to the igniter element). You NEED to make sure it is free and clear of all rock or it will not stay lit. Yes, you need to keep the switch pressed in for at least 45 seconds to allow the gas to fill the line. It says it on the directions. 
As far as putting in the propane tank...put the top end in first then follow with the rest of the tank. You’ve got this champ. 
I mean really...I’m a middle-aged single mom and I figured this out. )
Also, I didn’t have any issues with damage. I did knock this rating down 1 star because of the cover. It is a cheapo cover with writing on it. I’m sure I can find another one online.