I have a D average (1.4), but only because I had difficulty focusing on studying and exam taking.
A couple of points to address:
First, developing effective study and exam taking skills are absolutely crucial to law schools success. I'm not trying to be overly harsh, but when you say "only because I had difficulty" etc etc, it makes me think you're underestimating the problem.
You need to figure out what the obstacle is (anxiety, time pressure, distractions?) and come up with a plan to overcome it. Your law school probably has academic support programs. Look into them, they can be very helpful.
Until you get this figured out there isn't much point in worrying about internships or employment. You need to get a handle on this before the next round of exams and definitely before the bar exam.
Will I be able to get past this semester for internships and employment, if I do well?
This is tougher to answer because it depends on what you mean by "good employment" as well as your personal skills (networking ability, interpersonal skills, etc). If you're talking about big firms, prestigious federal positions and judicial clerkships, then yes, it's going to be a problem. Those jobs are very competitive. If you're talking about small firms, maybe local government offices, then it will be less of an issue as long as it is only one semester of low grades.
As far as post grad employment, one semester of low grades is not going to prevent you from getting a job. However, consistently low grades can be a problem.
As Citylaw said, lots of people stumble during their first semester. I know people who were disappointed with their first year grades and who went on to graduate and are now practicing lawyers. The factor they all had in common was that they went into overdrive to figure out and fix the problem .
Good Luck in your studies!