I see a lot of people worrying about speech problems. I was also worried and after 2 months of linguals I still wasn't feeling 100% comfortable about my speech.
BUT...I just got a new job after going through an interview and all I can say is that nobody noticed any speech problems!
I believe it's all in our minds...we tend to get self-conscious about braces and we think that everybody is noticing every little detail about them. Truth is that after a while nobody really notices
So stop worrying too much and keep talking...