If you have no vacuum pump.......
then you have no chance of even attempting to do it right.
I understand that you want to save money and learn new things. However this is not a DIY site. Read the rules.
I would recommend you call around to local service stations and get their opinions. Unlike HVAC, its a little easier to take your vehicle and a new compressor into a mechanic and ask him to install it.
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.