I can't speak to how strong or able you are, but if you're reasonably strong and have someone helping you who is too, you can go up and down stairs and through doorways easily on a dolly with pneumatic tyres. You just need to take it slowly and be careful, and make sure you have a couple of ratchet straps securing the machine to the dolly. Also, try if you can to get a lightweight aluminium dolly (that's rated to at least 400lbs / 170kg as the machine alone is 375lbs / 158kg).
I took my recently delivered HUO ECLE up 24 (full size) stairs with a removals guy helping me ... and that was with a very heavy steel dolly that took total weight to 425lbs / 190kg. There were no hairy moments and we got it up without even a hairline scratch.
Put a bit of foam / cardboard around edges and go slowly / lift one step at a time and stretch your back out after lifting to stop if cramping. If you're just wheeling it around, put the heavier stronger guy at the back of the dolly controlling it, and the other one guiding it (taking some of the weight off each time you lift / put it down). Guy guiding the dolly ought to be at least 90kg / 200lbs unless really strong.
Taking the pf out is completely redundant.