wow your picture make it so easy.
all of your diagrams labels are correct.
and yes I am hoping for your divorce lol. you didnt think that it was actually going to cost you less to install it yourself, but the time we got done buying tools, and adding all your hours spent on it did you? lol
While you have the router (bonus for you) it takes a special bit to make the groove in the boards, carefull with the router, its a blessing for some projects, but not completly user friendly all the time.
(tap the base of it with blue painters tape to avoid scratching the prefinished boards. and using the t&g bit make a grove in the section you have pointed out in the picture. (I usually get a t&g bit from berlands house of tools for 50 or so.) But since Ive found this site, I have seen other pits more redialy avaliable and cheaper but dont know off hand the name etc. but im sure if you search for it you will find it
**makes note to lookj for it and order a dozen**
cut the paper you have laid down back about 6 inches before the turned board on your next piece. (thats where you will be glueing it AND nailing it.
the turned board should go 1/2 way under the door, it looks like you will be cutting the carpeting back about 3 inches. then cut turn and tack the carpeting back down. ( I have no advice, I pay a carpet guy to do it on my jobs )
*Depending on how high your carpet is, you may have to also re bevel the board and finish it on the same side where you rip the tounge off the lenght side of the turned board. Hopefully not.
and yeas it takes longer, I could proboally put in 150 feet in a square room, in the same time it would take me to do a small section like that.
and one last tip, when you cut your angle, place a pencil under the board (on the side that you will keep, slanting upwards (making the top finished part of the board sligtly bigger than the bottom.) to just put a small compound angle cut on the board, this will help it fit tighter, and would only be a degree or three cut, then tap into place if good route and install. Tap into place widthwise, then tap into the turned board, one staple/or nail in the tounge then retap it into the turned board. It always seems to be off 1/32 or so after the first staple. staple the whole section from right to left.
when youre all done, call your buddies over and show them the great transition you did. then tell them how hard it was, and that they should hire someone to do thier floors