K guys, I've made a lot of progress lately

Am now getting married to someone really special! and yes, I still have challenges!
How does one overcome cold feet while being engaged and heading towards the wedding?
I'm totally fine when I'm with my fiance. But we're in a long distance relationship and sometimes I get scared, usually not because I see some flaw in her but because I'm committing for life. the feeling's there only once in a while.
Any ideas?