Airlines´ procedures for this may vary, but this is how we do it:
Use LNAV and VNAV (if desired) to get to the intermediate descent point (usually ca. 10NM for runway, 3000´ AAE). Then set the MCP altitude to a HIGHER altitude (we don´t set it to MDA, because it´s really easy to forget and the plane would level off, screwing up your approach).
When coming up on the intermediate descent point (in LNAV and ALT HOLD), turn down the V/S wheel to get onto the "virtual glideslope" - refer to the vertical deviation indication (just like a glideslope) to stay on the vertical profile. Once ca. 1000 feet below missed-approach altitude, set the MCP to missed approach altitude (to have it ready in case of a go-around).
When approaching the MDA, click on the SPEED button to disengage autothrottle (we rarely disconnect it, as eveyone seems to be doing in their youtube vids - it would not be able to save you when you get too slow, if you completely disconnect it). When pushing SPEED button, the A/T will revert to ARM (dormant, bur ready to help if you need it for go-around). Now align the hardware throttles and gain control of the thrust levers.
At MDA disconnect the autopilot and complete the landing manually. If airport not in sight, hit TOGA buttons for go-around (careful, AP will disengage!!)
Jan