What is absolutely necesary to finish the example flight in the 737 manual?

I am having trouble landing the 737 in the tutorial flight.I either get to the airport and the plane won't capture the glideslope or the route ends before I get to the airport even though everything seems ok in the FMC.Are the decision altitude and decision height necessary? I can set decision height but not altitude as there seems to be a bug/quirk with regards to the different display modes.Will the plane still land itself if everything is done correctly apart from setting the DA and DH?Thanks a lot.