I have done it many times, though nower days I have access to a machine,
You really need 3 levers, they don't need to be big ones though, lube the tyre bead with soap, there are many ways to break the bead, I used to use a mash hammer and blunt bolster chisel, push the tyre into the well with your knees, insert the first lever then pull it over the rim, I used cut up head and shoulder shampoo bottles to protect the rim, hold the lever down with your knee, then insert the next lever a few inches around the rim and do the same, it will be tighter, but again force the rest of the tyre into the well, that should give you room, once you get a decent amount over you will be able to pull the rest of the tyre over,
The second bead is the same, though it's more difficult to get the levers over the tyre, if you get it a bit over but you can't get any more, the hammer will work, but you will get better at doing it with experience,
Putting tyre on, Luke lube lube, the first bead may push over the rim, they are better if the tyre is warm, push the bead over by hand until you can get no more over, put your knee over one end, then lever over the other end, put your other knee near the end where your levering, small chunks at a time, if it starts to become difficult then make sure the tyre is in the well, it will eventually go over, if it's got an inner tube, you have to avoid pinching the tube doing all this,
Seating the bead, at times can seem impossible, but remember you can seat them with any air supply as long as you can put air in faster than it can escape,
I have at times used a bike inner tube, blown up just a little and stuffed in the gap between tyre and wheel, then pulled out once the tyre is pressed against the wheel well,
When it's easy it's easy, when it's hard it's bloody hard!
Look at some you tube videos, experience does make it easier!