Ok, I got it to work.
For the ones who want to do it manually, and don't have any previous nitdroid on the phone, here is how I did.:

I followed the steps to partioning and formating.:

1. Open up the xTerm and become root with this command:

sudo gainroot

2. First un mount the microsd card

umount /dev/mmcblk1p1

3. For this step you need to know the capacity of your memory card. The Android partition can only be 2GB, so you need to create a FAT partition that is so large there will only be 2GB left. The number must be in MB, example some recommended sizes are 1, 100, 2100, 6100, 14100, 30100. If its 8GB you can choose a number like 6100MB, if its 4GB you can choose a number like 2100MB. If your memory card is 2GB or below, you can choose 1MB as a number If you do not do this correctly you will not be able to use Android Market!

sfdisk -uM /dev/mmcblk1 << EOF
,<YOUR NUMBER IN MB>,C
,,L
,,
,,
EOF

4. Unmount microsd again as maemo sometimes tried to mount

umount /dev/mmcblk1p1

5. The actual formating!

mkdosfs /dev/mmcblk1p1
mke2fs -L NITDroid -j -m0 /dev/mmcblk1p2

Then, I downloaded both /NitDroid-0.0.8-Popov.tar.bz2, and nitdroid/nitdroid-kernel-2.6.28-06_final1_armel.ded via pc, and put them under MyDocs.

Then.:
mkdir -p /and
mount -o noatime,rw /dev/mmcblk1p2 /and
cd /home/user/MyDocs
rm -rf /and/*
bzcat NitDroid-0.0.8-Popov.tar.bz2 | tar xvC /and

Then.:

As I was already in MyDocs, dpkg -i nitdroid-kernel-2.6.28-06_final1_armel.deb.

This set up the multiboot. I just rebooted and now, I am good=)
Trying to install some apps now, and I hope people having trouble now will make it work!