So the key, without a doubt, is to eat small portions regularly.
I would have to disagree with the above post to certain extent, about necessarily sticking to one particular book or course. You can easily get sickened with the style of the course without that meaning that it's a bad course. You're just bored with it, and that's completely natural. It's so easy to think that you're bored with learning Gaelic, or that you can't do it. This may just be because you're getting sick to the back teeth of one particular tack. Try something else!! There's no crime in not finishing a course. I read every single Gaelic learner I could find, but not in one go, in the sense of it not being interspersed with other things.
I found that by reading the history of the language on the side and learning as much as I could about its contribution to the culture of Scotland, I was able to supplement my enjoyment of speaking the tongue itself with a strong sense of being involved in something very important. That's a good feeling to have. Everyone has different reasons for learning Gaelic, but anyone committing themselves to learning it and thereby to its future nourishment can feel proud of their contribution by understanding the background to its narrowly avoided demise
Although over-listening can cause a sense of being swamped with what you don't know at the beginning, I cannot recommend anything more highly than listening to recordings at Tobar an Dualchais. There is nothing better than the sound of native speakers, largely unburdened by modern affectation, speaking Gaelic in as natural a form as it gets. Perhaps this is more useful as you get a bit further on, but its absolutely fantastic to get a broad sense of the sound of the tongue, and makes for a beautiful experience at any time of day! People recounting stories often speak a little slower than those in debate or discussion on the radio too -like Ruairidh MacIlleathain does in his 'Litir'- and this can be invaluable for getting correct emphasis with phrases or passage of phrases without having to listen to them as spoken by Coinneach mòr at 100mph!
My motto when I was in the thick of learning the basics?
FAKE IT 'TIL YOU CAN MAKE IT BABY!
After you've got a hold of basic conversational Gaelic, stop thinking of yourself as 'a learner'; think of yourself as a fledgeling Gaelic speaker. If you spend the whole time thinking of yourself as a learner, it can be difficult to ever leave that mindset. There is no-one, as the clichè goes, who is not 'a learner of Gaelic' on some level, native or otherwise, but it is essential -if you decide its more than just a wee social and a bit of fun- to be learning to accept the idea that Gaelic is something that belongs to you, something you can carry with you everywhere you go, not just a hat that goes on and comes off once or twice a week when you've a spare minute or two or you're at class. Say everything you possibly can in Gaelic every day, talk to the wall, describe to yourself what's happening with everything you do, even if you don't get past tha mi.... it's a great thing to make Gaelic at home with you everywhere.
If you have children, whether they're going to Gaelic medium or not, they make the perfect conversation partners, because they don't judge you, they're naturally patient (maybe I've got good kids
) and even if there's no sense in which Gaelic is part of your cultural identity and you just enjoy learning languages, it will do your child no harm whatsoever to have Gaelic spoken around the house. If you have a dog or cat, they're your new convo partner now, even if they look at you sideways. Dogs are terrific to practice new phrases on, especially commands! 
There are probably a million and one other things, but I think that's enough for now.
The absolute best of luck to all of you....
Guma a thèid leibh uile!
