It is well worth getting it professionally sharpened. WELL worth the expenditure. A sharp chain means an easy, safe job. A dull chain means a difficult job, fatigue and a potential accident. Wear safety equipment which should include hard toed boots, leg chaps, eye protection, gloves, a hard hat and hearing protection.
Most chainsaws run on an oil and gasoline fuel mixture.
Print out a copy and post it in your garage. And for those who were wondering, the answer to the first question is 275 ml.