Its not hard at all, I believe you have an a604 auto same as me.

Tell your parts store year model you have and its a non turbo automatic.

Buy a set of jack stands and a floor jack, I recommend the 2.5 ton low profile from walmart by GM performance its under 40 bucks and jacks are 22 bucks also. Not the best but it'll get you by plus the low profile is great because our 2g's are lowered.

Buy a Haynes or Chiltons manuel while your at your local parts store. It gives you detail info. how to change the filter. Haynes manuel is under 20 bucks is good but having both is handy