Ahhh restoration, i have had a hand in the odd one. I will assume you have a vehicle mostly complete to write this.
Before we start, 9 out of 10 projects fail!
The Vehicle: Always nice if you can start, drive and video the whole lot. It will inspire you when you are running out of energy. Get snap Happy.
The Workplace: Treat it like you are working for someone else. Make it user friendly.
The Budget: That's your choice but if there's not $100 out of your wallet every week you will be more likely to fail.
Engine/ transmission: Do you have 20 Years? Unless you want a stock setup or are handy with a spanner i would say forget about building your own. Budget and types can range sooo much it's a whole other thread itself. If you buy unfinished project gear do Not do it unless they have proof.
The Tear-down: Don't label every little piece because there are 1000 guys on here who can help you with nuts and bolts. The other big bits are simple and after 40 years a percentage of the bolts will incorrect.
Parts: Haggle, wait, watch and get the best price you can but remember that every hour you're on a forum, gumtree or ebay is time you could be spending on your project.
GET A PARTS CAR!!!!!
Rust Repairs Shell
The hard bit now will be when the car is at it's most vulnerable. Guess what? So will you. You'll now have a stripped down and rusty lump of metal that doesn't hardly look like a car. This will sap all your energy. Break down the areas into sections (Panels) if you are serious you can do one a day (8Hrs) on each. Cover the rest of the car like a surgeon does if it starts to get to you. Get that sucker in Etch as soon as metalwork on each panel is done. Bodywork will follow.
Rust Repairs Panels
Same as above but get that repaired shell out of the shed (remember you are Male and you know you can multitask but focus your mind, focus it on one section at a time. You will work better that way.) Now as you repair a panel fit it, get your gaps right. Start at the back and go forward.
Bodywork: Now that the emotional part is over take a breath. You need to change your mental state. Bodywork is more like art than work, try to enjoy it. It's like crafting a clay model much the way they do for any prototype. Get some music cranking, you'll know when you are in the mood. FEEL THE CAR. It's important. You need to reconnect with it. It's becoming part of you now If you lack the skills do as much as you can, remember it's 90% prep 10% paint. Then get help to make her straight.
In the history of our planet there has never been a better time to learn.
Starting the car and driving it at this point will boost your ego. DO IT if you can!
Assembly: If you will use the car like i do there is little point in having a high quality finish underneath. Clean everything but don't go silly.
Interior: Try to find a car with a good one or you'll pay for it here. Having a mix of new and used parts is hard to pull off.
Once all this has been completed you will have the luxury of dealing with engineers, roadworthys and registration. If you manage to get to this point you may find yourself a changed man. I won't say how because i don't want to ruin it.
Be in that 10 % you won't regret it!