If you are absolutely determined to do this by yourself, take it slow. Ensuring your horses and happy and healthy comes first. Since you grew up with horses I'll assume you know how to care for them and a little about their behavior, that is good.
In my mind the first two things I want to build in a horse are respect and trust. With those comes partenership. There are a million exercises and techiques to those. Do research, a lot of it. Don't believe the first thing you see. There are too many opinions out there.
What I woud do first is join up: there are a bunch of threads on here about that. You want to do some desensitizing, felxing, lunging, backing, confidence building, suppling etc etc.
Some things to keep in mind always:
- Take it slow, don't rush.
- Be forgiving.
- Never make a horse fearful of the wrong answer.
- Horses learn form the release of pressure, not the pressure.
- Read your horse, listen,
- Alow breaks and rest for a good effort.
- Reward the smallest try.
- Stay calm.
- Always end on a good note.
- Set small goals within your big goals.
- If you start of further back than you finished yesterday that is ok, so long as you make progress from where you started that day.
- Frustration will get you no where.
- Do it for the love of the horse.
I know a lot of people will tell you to sell the horses or get a trainer but every great trainer started from somewhere and you have to learn somehow. Be smart, know what you are doing and don't be afraid to ask for help.
Hold On To What You Love. When It Tries To Buck You Off Hold On Even Tighter!