I'm looking at restoring one of the cars mentioned in the title. This would my first restoration. I've never really restored a car before but I have enough prior about vehicles and parts for me to attempt one all be it a long drawn one.

Can you guys give me any advice for a first time restoration?
What things should I expect to give me problems?
How much should I look to budget?
Why wouldn't you restore a Capri or a Cortina?
How long should I estimate on completing the project?
Have any of you guys re designed original parts and upgraded them in any form of capacity?