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You need 'for' there, and in #2. There's little difference between 1 and 2. 2 follows the traditional grammar pattern, but 1 could be used when speaking to the person, especially if they haven't changed and you are still angry with them for sending you to jail.
What do these mean?
1. If my skills in estimating and managing IT projects would have been that bad, I would have fired myself a few times... (What kind of conditional is this? Is it a mixed conditional?)
2. If my skills in estimating and managing IT projects had been that bad, I would have fired myself a few times... (Past Conditional?)
1. If it wasn't for you, I wouldn't have been in jail.
2. If it hadn't been for you, I wouldn't have been in jail.
The ones above are correct.
What about these ones? What do they mean? If they're not correct, why?
1. I could have made half a grand if they had it in stock. (If this is wrong, why? #1 is correct? Or does that type of mixed condtional only work sometimes?)
2. I could have made half a grand if they had got it in stock.
Thanks.
Mixed Conditionals 
Linear Mode
