You most certainly can. I've been doing that for a while now.
During installation, you should make sure that you select the old home partition to be used as "home" and that you do not format it. That is basically all there is to it; that's how you use your old home partition.
Now, because you mentioned you did some things wrong, you will probably want to delete your old settings as well. Most (all? Any gurus here to confirm?) of these are stored in the dot folders and files (e.g.
/home/zignd/.config/). By moving all the dot folders and files away from
/home/zignd/ to for example
/home/zignd/backup-dotfiles you can reset all the settings. By moving instead of removing you can restore the settings you'd want. For example, the
.filezilla folder might contain some settings you can still use and is most likely not responsible for the issues you have.