Somebody just told you your sewer line needs repair, maybe replacement, and quoted a number that made your stomach drop. Take a breath. Most of the worry comes from not knowing what's going on, and that gets easier once you understand what's happening under your yard and what your real options are.
Start with what the words mean. A sewer line rarely fails all at once. It develops specific problems in specific spots, roots at a joint, a cracked section, a low spot where water pools, a stretch that's collapsed, and the right response depends entirely on which one you have and where. Sometimes a repair means fixing one bad section while the rest of the line keeps serving. Sometimes lining the existing pipe solves it without excavation. Full replacement is right when the line calls for it, not just because someone quoted it first. The contractor's inspection shows which situation is yours.
The process goes in order. You see the evidence, hear every option explained in plain English, what each involves and what each is for, and the decision gets made by you, at your pace, with a licensed contractor performing the work when you're ready. It starts with a conversation.