Just downloaded this last night and I'm hooked. I started out just sending a number or unmanned single stage rockets into the sea just to experiment with the different engines. I then build a few 2 stage rockets and got a satellite into orbit but forgot to add solar panels so its currently just floating up there dead. Next up I sent a kerbal into orbit using the same two stage rocket from my satellite launch.
That all went very well apart from a few mishaps with SRB decoupling on my first few rockets.
I then tried to send 3 Kerbals into orbit using the larger rockets and it all went to hell. I read the asparagus method and tried to implement it as my first stage, but it just resulted in a really wobbly rocket on the launch pad and then none of the engines would decouple when they ran out of fuel. The wobble I think is down to lack of struts the decoupling thing however I've no idea about, can anyone offer some advice? So far managed to get that far using only the in game tutorials but I watched the KSP 101 video this morning and that's helped a lot with the manoeuvring side of thing but I'm still unclear why my rockets refuse to separate.
If it was very wobbely it can just break so that none of the stages work anymore, it doesn't look broken but you can tell it is by trying to move navball, if you can't move it then the rocket is broken, so pressing space bar won't do anything.