Compared to Greek, I think it takes about twice as long to make it through the elementary grammar phase of learning biblical Hebrew. This is discouraging for many students. I know it was for me. If you are struggling with first or second year Hebrew, just know that this is normal — you're OK.
Why is Hebrew so much more difficult? Morphology. Think about how much time you spent on morphology in your Greek classes compared to Hebrew. Some spend an entire year on Hebrew morphology before moving on to syntax. Others have a more balanced approach, but all spend more time on Hebrew morphology than Greek.
If you are at least halfway open to the idea that our approach to teaching Hebrew might be skewed, check out William P. Griffin's essay "Killing a Dead Language: A Case against Emphasizing Vowel Points when Teaching Biblical Hebrew." Why do so many give up on Hebrew? Griffin answers,
We are not teaching one language, but two; if we emphasize the accents, make that two and a half. We demand that our students understand and replicate an elaborate cellophane overlay that is more complicated than the language it attempts to clarify.
Griffin has written a grammar that de-emphasizes the vowel points, Hebrew for Reading Comprehension. I could not find a print copy online, but the grammar is sold by Logos and Griffin has a website devoted to it where you can check out some samples. I don't know if this is the answer or not, but I am intrigued.
I was never able to master all the morphological rules for weak verbs though I certainly gave it my best effort. I have multiple notecards for every chapter of Fuller's grammar, and I think I've gone through the book from cover to cover three times. It just doesn't stick, and I'm OK with this. I can read Hebrew, and if I need to look up some rule on weak verbs, I know where to turn.
If you struggle with Hebrew, grace and peace to you. Don't listen to that little voice coming from your skewed grammatical conscience that says, "You can't start reading your Hebrew Bible if you can't recite all the rules for germinate verbs. That's cheating!" Read. Keep at it, and know that you aren't alone. Hebrew just takes longer, and the fog doesn't start to lift until you start reading.