noob friendly, as in no command line? Ok, because solca has better things to do (like fix the time), I'll do it on the weekend.

But, this is it in a nutshell.

You need:

Linux with gparted plus whatever it wants you to install.
Tablet running Maemo.
Free space on your memory card

First, plug in the tablet. The internel card should pop up as a drive.
Next, open gparted
Then, unmount drive.
Then, shrink the FAT32 partition, create a "unallocated" partition, then create a ext3 partition. so (fat,unallocated,ext3)
Then, copy the tar.bz2 file into the ext3 section
Open a terminal, and "change directory" into the card. Usually "cd /media/disk/"
type "sudo tar -xjvpf rootfs_nitdroid.tar.bz2"
Then, off the tablet and pull the charging cord from the tablet.
Hold down the home and switch buttons, and plug in the charger.
The tablet is now in USB update mode.
Download flasher-3.0
make sure the kernel image is in the same directory as the flasher.
Open terminal, and go to where the flasher is.
type "sudo ./flasher -f -k zImage-nitdroid-n8x0 -R" or "sudo ./flasher-3.0 -f -k zImage-nitdroid-n8x0 -R"

DONE!