how to install wireless access points throughout house

Yes, you can cable them. Personally if it were me I'd use a mix of wired and wireless. Wired for example run to the room which is going to be a home office and the one where your entertainment equipment (TV/Sky box/Games console) is going to be, personally I'd have a wired RJ45 socket in each room and you can do that when the electrician is doing their first fix and place the network socket near a mains socket. Number each of the RJ45 faceplates and access points and each of the cables feeding them at the switch end of each cable with the same number to help fault diagnosis in the future. Nothing worse than turning up to a networking fault with 16 cables plugged into a switch with no labelling then having to figure out which one goes to the room where there is a fault.

You can get stuff which uses Power Over Ethernet, PoE but you need your switch to support it to supply the devices. Ubiquity wifi network gear which I recommend for a serious install uses PoE.

For access points, personally I'd use Ubiquiti UAC access points placing them on the ceiling, one on each floor to provide coverage as the picture below. These are commercial units so work very well.

Yes pretty much that and use either the switch or the adapter but the adapter means one more plug and one more set of leads per device so doing it with the switch makes it a lot neater. Personally though I'd look at the APs they do that do both 2.4GHz and 5GHz. Whilst the ones you listed are 802.11n it is 2.4GHz only and if you do a quick wifi scan of the area you'll find that 2.4GHz is jam packed full of wifi networks and there's not many wifi networks at all on 5GHz.

The web management software is very good and using it is no different to how you would configure your wireless network on your ISP provided router. It does however have more advanced options for those who want to do tweaking to wring every last ounce of performance out of them.