Play with AR >=8, you will fail the first three thousand plays, but trust me, by then, you can finish most insanes, oh and you gotta not give a shit about your profile with the 50% accuracy you will get for the first 2 months of playing. What's the fun in playing osu! if you can FC everything? When I started, I only played insanes, and it's really challenging (no fail mod).
Though now, I'm playing with mods and only mod possible on insane for me is hidden, and even then, it's hard so I practise on hards and normals. Also, don't worry if your profile shows accuracy of 50%.
Examples:
http://osu.ppy.sh/s/24325 - Lunatic, Can't defeat Airman - Play this on half time though cause this is for patterns, AR 10 is not worth the time, and there aren't many ranked maps that have AR 10.
By getting used to AR of 7 or more early, you can essentially read every pattern in every insane, which is your road to becoming a cookiezi and
impressing your friends.
Also, another tip is to always alternate your keyboard keys, or otherwise, alternate on triplets and streams if alternating everything is too hard.
Disclaimer: This strategy is not for the casual player, it's for those with heaps of patience and ability to never give up. Also, if you are planning to play normals or easy in the future, the slow AR is impossible where you will need HR + DT to read it. My friends can SS hards, but can't even survive 5 seconds into insanes. My other friend can FC insanes, but can't FC hards. They both have same amount of time played. Now you decide which is better.