Welcome to the rust belt! Since 2014, my daily driver has been a 2004 Pontiac Grand Am GT (v6 3400, fusion orange, SCT hood and spoiler). When I bought this car, it was so clean underneath, you could almost eat off of it! Sad, winter roads are paying a toll on this ride! Here I am at 211k miles, the body cladding is hiding that the metal for the rocker panels is almost all gone. In 2020, I had all the brake lines replaced (I would have done them myself, but I just got the keys to my new home and that was not an option at the time). Well, last week, one of the fuel lines as it comes up and around the tank, has a leak.
A friend of mine let me get the car on his lift and Thursday evening we almost had the job done! We finished it Saturday morning. I went the cheap route and used nylon replacement fuel tubing. I was not 100% what I needed (beyond size of tubing), so I bought two kits that came with a some helpful supplies and I bought couplers (they work much like shark bite fittings from plumbing and can match any combo of metal and nylon which is awesome)! This is the second car I have used this stuff on and worked GREAT! I kept the front small section of fuel line (as I did not want to goof with that area and they looked "passable"; if I do have to mess with it in the future, I have plenty of spare supplies).
I could have cut the factory nylon lines at the tank and used those couplers to connect them, but I instead opted to use the metal pieces to connect back to the factory fittings. I also pulled scrape pieces of wire loom material to put over sections of the line that travels near the exhaust.
For more money, I could have got aftermarket replacement lines (and I have worked with one of those kits before on a different Grand Am). Considering the condition of this car, I felt this was the most cost and time efficient option. For those faced with similar decision with a Monte or any car, these kits can help.
And this weekend, I have probably put around 200 miles on the car since finishing this job and all is leak free since the first start!

Here are links for what I used (these are pretty generic kits, but they did the job):

 

That lift looks like a lifesaver! I had to re-run my monte's lines a few years ago (but did in in hard line with AN ends) and that was miserable getting up and down 1000 times.

 

This was my friend's 2-post lift. I will have a 4 post/drive on lift in the garage I am building. And this job would still be equally as easy with a 4 post lift.

I could have done this on the ground, but as you said, a lot of excessive getting up and out from under the car.