I can second the recommendation for Pimsleur. I managed to take seven 30 minute lessons before a trip to a conference in Israel, and got people starting to talk

I can second the recommendation for Pimsleur. I managed to take seven 30 minute lessons before a trip to a conference in Israel, and got people starting to talk to me in Hebrew based on the few sentences I knew, apparently due to a pretty good pronunciation. The importance of getting to sound right from the start is something that is stressed a lot in the Pimsleur description, and I think it makes sense. Having a good pronunciation will give you so much better confidence, and chances to actually interact with native speakers, while they also claim it is much harder for the brain to relearn something that got wrongly learned, than learning it correctly from the start.