Removing old fuel lines

[In The Ten Ring]

It's high time I removed my old fuel line. I ASSUME the best way to remove the in-cab lines is upwards not downwards. Is that correct?

I also plan to use dishwashing detergent on those rubber grommets in the cab floor to get the lines through easier then remove the grommets and replace....what say you guys?

I would think one should put the new grommet into the floor THEN feed the line through it....does that sound right?