Once you have your spacecraft in orbit around Earth, you only have to overcome the the remaining drag of the upper atmosphere, the solar wind in case you are go

Once you have your spacecraft in orbit around Earth, you only have to overcome the the remaining drag of the upper atmosphere, the solar wind in case you are going towards the sun and maybe a couple of other [small] effects I am missing. But once you have enough trust to not slow down due to those effects, it just becomes a matter of time. Keep circling Earth, accelerating with whatever tiny surplus trust you have available and eventually you will reach escape velocity and off you go.