The concept of perfective/imperfective seemed frightening to me at first, when I undertook the goal of learning this language. But, in practice, it wasn't terribly complicated, although I am still guilty of choosing the wrong aspect for the wrong situation. Aspect of the Russian Verbs <-- Here's the explanation on masterrussian.com, with some examples.

The terms that really threw me, personally, were those that are used in declensions (nouns): nominative, accusative, genitive, dative, prepositional and instrumental cases.. For a great while I missed the obvious, that these names were self-descriptive - nominative = name (nom) , accusative = accusatory (i.e., accusing the dir. object), genitive = [of the] source (genesis), dative = recipient (Latin "datus" = "given") prepositional = used in prepositions, instrumental = [descriptive of] the instrument used ... my terror for the terms ceased when I came to this realization.

Everyone has their own learning style, but it behooves me, when encountering strange verbiage like this, to remember it but to hesitate to dissect its meaning, until later when I can conceptualize the term on all fronts - as you can tell, etymology is important to me..

well! - I'd meant to be more helpful with this post, but I can explain further if anything requires elucidation..