My biggest challenges were as follows:
1) Bouyancy Control - I had trouble getting under, so I would add weight, then I would be overweighted and struggling to stay off the bottom. I overcame this by working on my technique so that I could get down with less weight. Many new divers don't realize how much they move their arms and legs near the surface, which tends to keep them afloat. Try to move as little as possible and that will help. Also, you don't need enough weight to sink completely to the bottom, just enough to get smoothly beneath the surface a few feet and then descend the rest of the way on your own. However, as you take weight off, be sure to account for the extra lift you get once your tank empties, or you will be in for an unpleasant surprize at the end of your dive. Working with more experienced divers helped me out here. Don't be afraid to ask for help mastering your skills, even after you are certified.
2) Finding buddies - I didn't dive for almost 10 years after I got certified, 'cause I didn't know any one. (I was certified long before the internet was commonplace). I stumbled upon a local dive club through an ad in the paper, and once I got involved with them, I always had a buddy. I am still a member of that dive club today.
3) Large boobs - custom-made westuits, back inflated BC. End of squishing. (ha ha)
4) Long hair - my hair is very thick and I used to wear it much, much longer. I would tie it back but it was always getting loose and in my face. I used to wear this little neoprene swim cap that had a little strap that goes under the chin, when I dove. It looked corny as He##, but it did the trick. Then I discovered do-rags and started using that. I found one at Sally's Hair Supply for less than $5.00.
5) Nervousness - I loved diving from the start, but I was nervous at first, which is natural. When I joined the dive club, a few more experienced divers took me under their wings and mentored me, which really helped me to improve my skills and confidence. Now I do the same for others.
Taking classes beyond Openwater also helped. I think everyone should take Rescue, because it makes you more calm knowing that you are a more-prepared diver. Also, just keep diving. The more dives you get in, the easier and more pleasant it becomes.
Congratulations on learning to dive. Diving has brought me so much joy over the years. May it do the same for you.
Safe diving to you,
Laura