It can be done
Right now meetings aren't available to me. So, there's no other option but "alone"... And, yet, I honestly don't really think of this as alone.
I come on 3FC very regularly and talk with others. My own mother has lost over 100 pounds and I chat with her about weight loss. My husband is very supportive of my efforts.
As long as you build up the support system that you need on this journey, then you won't be alone. You'll just be doing it slightly differently. But, still successfully!