I need to get current -> openSuse Leap 15.5 - Currently on Leap 42.3 - (I would implement automatic updates after getting there so this doesn't happen again) - Any publication "How to" to get me there would be appreciated

A fresh install is probably the best way to proceed. Back up any important data first.

A similar thread:
https://forums.opensuse.org/t/upgrad...-1-15-2/142926

At least one of our openSUSE members in that thread claimed to have successfully upgraded from Leap 42.3 -> Leap 15.2 in one step. YMMV.

openSUSE recommendations:
https://en.opensuse.org/SDB:System_upgrade

BTW, openSUSE Leap 15.5 is still at Alpha. Best to move to Leap 15.4 for now.

I definitely agree with backing up all of the important stuff first - data, scripts, etc.

You could try and do a single upgrade / install over the top using physical media and resort to a fresh install if that causes issues.

I have too many openSUSE installations to track. My many PCs are all multiboot. Old installations either stay as the are, or get upgraded either in place or a clone made first to upgrade to, so usually accumulate with each release. Suffice to say the currently supported number just got lower due to 15.3 officially reaching EOL a few days ago, so the current count is down to around 30. The vast majority of my 15.4s and my 15.5s are upgrades dating as far back as 13.1 originally. My most recent upgrades to 15.5alpha included one older than 15.3, 15.2 I think. Tumbleweed has evolved zypper into a very high competence upgrader. IMO, the only thing a fresh upgrade usually accomplishes that an upgrade won't is cleaning out stale files and configurations, which I find rarely comprise any problem. Zypper upgrades for me work. A 42.3 to 15.0 to 15.1 to 15.2 to 15.3 to 15.4 upgrade via zypper would tie up the PC at least a couple hours or more, depending on available bandwidth, but keep the installed packages state you have now, minus any no longer provided packages. A fresh installation should take less time, but could wind up taking quite a bit more time by the time any customized configurations are reproduced. A fresh installation defaults to one nominal BTRFS partition supporting both / and /home, while the old likely has you on EXT4 for / and a separate /home on XFS or EXT4. BTRFS may or may not be something you want to switch to. It does provide convenient snapshotting, which doesn't help my complicated backup scheme at all. If you had a separate /home, you more conveniently preserve all your personal settings that haven't become obsolete, while installing a fresh OS.

If you choose upgrade, it's best to disable or remove optional repos, then upgrade, then any you find you still need you can add back. This minimizes risk of the upgrade process itself causing you trouble that is difficult or impossible to work through without starting over. In theory at least, it avoids any kind of upgrade trouble.

15.5 is still alpha, not due for release until May. Unless you're experienced with pre-release operating systems in general, or it's to be an [i]additional[i] installation, and/or because you wish to be a contributing tester or developer, 15.4 is where you should stop.

IOW, there are multiple things to consider, and different options to take. Whichever combination you choose, unless you don't stop at 15.4, it can and should go well. Even with 15.5, it well could. I've succeeded with 15.4-to-15.5 around 6 times so far.