How many minor tweaks have you made to your store?
Have you documented or commented out every change?
How many 3rd party mods have you installed?
I am trying to do a minor upgrade from 4.0.18 to .19 and I am having difficulty -- I can't IMAGINE what's involved going to 4.1.x -- I will probably pay xcart to do this for me - but only after EVERY mod that i use is updated.
No matter what you do, backup, backup, backup... you can always restore to what you had.
Try this -- install a virgin 4.0.x, then "upgrade" to 4.1.2 -- I haven't tried this -- but I'm sure if you're interested, it's worth attempting, just to learn the process.
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xcart 4.5.4 gold+ w/x-payments 1.0.6; xcart gold 4.4.4
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