To be certain, you should:
* Consult your owner's manual: This is the best resource for the precise location and instructions for changing the oil filter.
* Look at a diagram: Search online for "1995 Chevy Blazer [engine size] oil filter location" – you'll find diagrams and pictures.
Be prepared to get a little greasy when locating it, as it's usually somewhat tucked away in the engine compartment.