We live in an English environment, but our mother tongue is Arabic and I want it to be so for my baby. So we speak it 3 days a week. We split the other days between French and English. Surprisingly, It felt unnatural in the beginning and I couldn't wait for the Arabic days to come.
But I got used to it and It feels more and more spontaneous now.
I am also planning to introduce German and Spanish (even if I am not fluent). So I'll be just repeating few sentences hoping it will improve by time. In addition, I'll be learning Chinese with him, I'll try to repeat basic sentences (it sounds boring
) but I think I'll rely more on audio files and LR.
In a nutshell, speaking your native language may make you feel bonding better with your children but teaching them foreign languages means that you care about their education even if you won't be 100% comfortable with. If this is your firm choice than go for it, you'll get used to it eventually. If not, you can always adjust it.