You are missing something.
The difficulty is in doing skills alone. When you do the whole package, it becomes much easier.
Is it easier to rebuild an alternator when it goes bad, or just buy a new alternator?
Think about it like this? Would it be easier to figure out how many skill points to take away for each level? which level came first? Which skills were class skills at that point? Etc
Or... Put you back on the character screen and let you level up normally.