Jossed is very simple to play. Request your free board using the downloads form and choose your timescale. I normally give myself 3 months but you could decide on 6 months or even a year. To help you get started try reading about How to use Jossed and understanding the board.
Be realistic with your goals. You're unlikely to learn to play the guitar in one board but you could commit to making sure that you have a suitable instrument and that it's in the right condition or to start taking lessons.
There are no right or wrong ways of playing. Lots of people don't complete the board in the time-frame that they give themselves but I have no problem with giving yourself an extension or simplifying tasks. Just do as much as you can and think how you can make further progress towards your goal on your next board.
This website includes lots of tips and advice but, if you do feel yourself getting stuck, feel free to contact me using the form below.