after rebuilt userland, update /dev and /etc ?

[macintoshzoom]

I succeeded updating my system to OpenBSD 4.4-current (GENERIC.MP) (yup 
yup!), and after I rebuilt my kernel and reboot I rebuilt my userland.
Ok till here.

Now I have to check http://www.openbsd.org/faq/current.html and update 
/etc and /dev ... What!

I do not know about most programs this page is telling me about, most of 
them I never installed (e.g. rtadvd) nor it seems the system installed 
it on my behalf, so may I have understand that for this e.g. rtadvd I 
have nothing to do by now.
Any script to tell me better info here?

Can you give me some light about what do I have to do at this stage, or 
what you use to do here?
( http://www.openbsd.org/faq/current.html )

e.g.: At section 2008/07/24 - changes in libc and libm

What? What is that? It seems main libraries.
Let's go if I have some of these installed:
$ pkg_info | grep libc
libcddb-1.3.0       library to access data on a CDDB server
libcdio-0.80p2      compact disk input and control library
libcroco-0.6.1p0    generic CSS parsing library for GNOME project

??

$ pkg_info | grep libm
libmad-0.15.1bp1    high-quality MPEG audio decoder
libmal-0.44         MAL convenience library
libmatroska-0.8.1   extensible open standard audio/video container library
libmikmod-3.1.10p4  mikmod sound library
libmng-1.0.10       Multiple-image Network Graphics (MNG) reference library
libmpcdec-1.2.6     musepack decoder library
libmpeg2-0.4.1      free MPEG-2 video stream decoder
libmspack-20040308a library for handling microsoft compression formats
libmtp-0.2.6.1p0    Media Transfer Protocol (MTP) implementation
$

Terror, panic is invading me, what do I have to do with all those to 
update it?
Moreover, this "2008/07/24 - changes in libc and libm" says also:

4. Build and install gcc.
What? Which one? Those gcc I installed from packages or the gcc that 
comes with the system and I don't know which one it is as pkg_info 
didn't tell me about?
If your platform uses gcc 2.95.3: blah blah
If your platform uses gcc 3.3.5: blah blah
??

$ pkg_info | grep gcc
gcc-4.2.20070307p7  GNU compiler collection: core C compiler
$

Still, again, terror, panic is invading me to make (or to forget) 
something wrong.

Please, have a pint of caipirinha
( http://en.wikipedia.org/wiki/Caipirinha ) with me and give some clues!

Note: If I survice from here, (I will do for sure) my next todo steps: 
Install xenocara with radeonhd for my ASUS "ATI Radeon HD 2400 Pro" 
videocard (?!) and updating all my installed ports and packages (!?)
.. will need more caipirinhas and help!

Mac