You know I've always had a hard time w/ ligaments too, & I thought it was just me. I used to get so excited thinking "this is it" & then nothing would happen. . . no cute bouncing baby goat. So, I always take the ligaments loosening up with a grain of salt now & I look for other signs to go...
I haven't posted on BYC in awhile (a lot of family stuff & busy with our goats), but everybody's given you great advice & the link that glenolam gave you has a TON of info about goats & great pictures of what a goat looks like that's close to labor. I would suggest just in case of an emergency...