Tried to find good wood stove installation videos. So far they all focus on installing a pipe… in the wall, on the chimney, through the roof. No one focuses on attaching the pipe to the stove. Reading some forums apparently it’s not a big deal - you’re not actually all that concerned with a perfect, airtight seal. The chimney (liner) will have a draft of hot air moving upwards, drawing any air away from the stove and pipes. If there isn’t a perfect seal on the pipes, you lose a pinch of draft to air being sucked in. But in a worst case scenario (short of chimney fire) a backwards draft would let smoke into the room.
Additionally, I believe the main problems we had with the last stove were in part due to weak draft, so it might make a difference to get that good seal and have every bit of draft at my disposal.
Still my bigger concern is that the conversion pipe exiting the stove to the 6" size may be too long - have to measure everything when I’m not lying in bed doing internet research, and see if/how the pipe installation can be done.
Installing a freestanding soapstone on a 9" brick shelf where an insert once was. Steel liner is already installed from my last freestanding stove that I didn't install.
EDIT: Please see latest comment for new questions!