Whether you can do your own plumbing work depends on your local code. Denver forbids homeowners from even changing out a toilet.
I believe all underground copper solder joints need silver solder unless I'm way out of date in my code understanding. I'd use soft copper to avoid any underground joints.
When I had this done on a rental, they dug a hole at the meter in the street, went into the basement and then drilled through the dirt with a homemade bit made out of pipe. When the drill went into the hole in the street, they attached the copper in the basement to the bit, then pulled the copper underground into the hole. (maybe vice versa on direction). The drill was one inch galvanized pipe with a homemade bit on the end and a water hose attached at the back which fed thru the bit and flushed out the debris into the basement. Used a half inch electric drill to spin it. (can't remember how it attached). Could easily have been turned by hand given the soil in our neighborhood. Took about 2 hrs for the whole job. They dug the hole inthe street with a backhoe. Distance was about 30-40 ft.
You could also dig down and repair the existing pipe. I've seen that done.
Don't know what the code is on materials. Everyone around here uses copper tubing as far as I know. City has a lot of lead in the mains. Joint has to be made between the lead and the copper. Farmer's union??

Mine was 1" copper. Inspector did have to look at joint in street before they backfilled. About $2500 as I recall about 8 yrs ago. Good enough money for 2 hrs work that I wondered if I should become a plumber. It involved the plumber, his backhoe operator and two hired hands with shovels. I watched the plumber pay the hired hands about $50 for their work when the job was done.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13