Cable is in but quick question. Before setting up is there a position that the high screw should be in? Screwed all the way in or out or does it mitt matter too much as will be adjusting anyway?
You can set the limit screws without the cable in by pushing on the derailleur yourself and turning the cranks (with the bike suspended). In many ways it’s best to do it without the cable because it takes the possibility of tension and / or shifter issues out of the equation.
1. Wind both of the limit screws all of the way in. You may need to push the derailleur onto a lower gear to take the pressure off the H-limit screw to allow you to do this.
2. Whilst spinning the cranks, back off the H-limit screw until the chain drops onto the smallest sprocket and so that when viewed from behind the upper jockey wheel is in line with the smallest sprocket. You should now be able to push against the derailleur while turning the cranks to shift up a few sprockets and when you let go of the derailleur (still turning the cranks) it should drop down onto the smallest sprocket nicely.
3. Push the derailleur whilst turning the cranks to shift up through the sprockets until it won’t go any further. It may not be able to shift up to the largest sprocket at this point.
4. Back off the L-limit screw until the chain shifts onto the largest sprockets and then a little more so that, when viewed from behind, the upper jockey wheel is inline with (or slightly outboard of) the largest sprocket.
You should now be able to push / release the derailleur through all of the gears.
5. With the derailleur held in the lowest gear (highest sprocket) position check that the distance between the upper jockey wheel and the largest sprocket is correct (either using the tool, or it should be ~15mm). If not, use the B-screw to adjust the gap.
Once you’ve done all that you can install the cable (make sure the shifter is shifted to the highest gear and the cable adjuster is wound nearly all of the way in) and index the gears.