Yes, those connectors are what is required. The riser clamps may require opening the wall above. If it goes through the middle of a stud bay, you can just install it using the floor as the support, otherwise, you have to get creative. A tall stack of CI can weigh hundreds of pounds. Now, the horizontal offshoots may support it, but it also could sag considering lead is maleable...so, it needs to be supported BEFORE you cut anything. Convert to pvc at the outlet of the wye using another nohub connector.
Word of warning, the snap cutter usually makes a fairly decent cut, but if the pipe is particularly old and maybe thin, it can shatter. If the tool is well used, the cutter teeth may be a little dull, making a nice cut harder. It literally squeezes the pipe with what looks sort of like an oversized bike chain with round beveled disks placed around it. Those come to a point and when tightened, produce immense pressure which, once you get it tight enough, will crack the pipe at that point. Once you have the section cut out, you may need to grind things to get the edges smoother, but if you're lucky, you won't. Depending on the tool, you may need to be careful keeping the chain nice and straight until it gets tight...the straighter you start out with, the cleaner the cut. They usually don't have a huge amount of side-to-side play, but again, when old they get stretched, and it can make a difference.
I've rented one at HD a couple of times. They don't tend to get a lot of use, and the ones I've gotten were nearly new. Your results may differ! From start to finish, a cut only takes a couple of minutes once you figure out how it goes together (it's pretty simple). So, often, you only need an hour or two for the rental depending on how far away it is.
