1990 Chevy S-10 Starter problems I think

Engine Mechanical problem
1990 Chevy S-10 Engine Size unknown Wheel Drive Type unknown Automatic? Miles

I have a 1990 chevy s10 and for a long time it was hard to start requiring alot of gas, but now it wont even start to turn over unless jumping from a running vehicle. Someone told me that this was probably the starter, if so, how do I replace it, I have never worked on cars before but am a fairly quick learner and am also very good with tools, as well if I replace the starter and it still doesn't start where do I look next?