The most important thing is not to force your situation. I mean when you are obsessed with Bitcoin investment you can ignore your needs and that will mess up your financial management.
What you need to know first is how much money you make. how much do you need to spend? how much can be left for savings? and you can invest the rest in Bitcoin.
What you should also know is that Bitcoin will not change your life in a short time. enjoy the process never give up.