I think i understand what you mean. I should do this so as to not put any obstacles in front of me. The as is important in giving the meaning. But I am afraid I do not know the Gramatical rule for this.

I should do this, so don't put any obstacles in front of me. I need to do this so don't put any obstacles in my way. I should do this, so best not to put any obstacles in front of me.