From my personal experience a buddy is critical....I personally need someone to hold me accountable. When I was meeting a friend at 4:30 in the morning I went much more regularly - even at that horrendous hour

I have recently (today) completed a 12 week "bootcamp" with my company - if you can find one that will fit in your schedule I highly recommend this type of workout. The group atmosphere not only makes it fun but challenging. We start as a group and finish as a group. I will tell you that I am the most out of shape person there....still have 75+ pounds to lose.....but everyone is extremely encouraging.
Someone else mentioned this but it's so hard but so necessary in my opinion - STAY AWAY FROM THE SCALE. I just finished this 12 week session - I am proud of my results but would have done better if I had given the nutrition part 100%. However with that said I lost 5 pounds - in 12 weeks. HOWEVER, I also lost over 8 inches (Arm, calf, and thigh are only measured on one side so technically probably about 3-5 inches more than that), almost 15 pounds of fat and I gained almost 10 pounds of muscle. And in my pictures I can see a difference. This next 12 weeks I'm committing to giving the nutrition my all.....according to our coaches nutrition is 70% of it....maybe 80%. When you look at that and the results someone like me had without doing the nutrition....well I'm expecting great things from myself this next 12 weeks

With that said I would have been so disappointed with the scale alone. I mean I have worked my butt off 3X a week for 12 weeks and lost 5 pounds? But....with the whole picture I am happy. So if you can get someone to take before and after pics and do your bodyfat % I would definitely do that.
Good luck!