Cutting a door opening through a brick wall can actually be dangerous. If the brick is in good shape, there could still be problems with the mortar, settling and/or load bearing issues.. Is this wall on a house with 1 floor or 2? If there is an upstairs above, then you will need to consider what you need to support the brick above the cut, it may take more than a lintel. Then there is the issue of the wall ties. Be careful when pulling the bricks down, they may be attached to wall studs in a way that could cause the brick to suddenly pop loose when you pull against them. It's best to remove a few bricks at a time than to try to pull away large areas.
Good Golly, this is one of those jobs where a pro might be needed...
[URL="http://www.houserepairtalk.com/announcement.php?f=39&a=6"][size=3]The Ten Commandments of House Repair Talk[/size][/URL]
[URL="http://home.bellsouth.net/p/s/community.dll?ep=16&groupid=289528&ck="]Square Eye's home page[/URL]