It would be easier, faster, and more successful to just replay the game.
Using the console to buff up skills or stats is one thing, but to try to complete quests? Unless you set all the stages you need to set, set or clear all the flags you need to, add or remove the items you need to, start and stop the scripts that are needed for the next stage of the quest, this is going to blow up in your face in the most spectacular fashion.