Since you havent talked about any of these issues to date just press on.
Forget about the trimming stuff and dont make a big deal of the size either.
You being aware is one thing so, as others have indicated, bring the lube and extend the foreplay and take it easy. Making an issue of size may make her feel like she should have problems and so she will.
If it is a first go for her it may be a bit rough 6 or 9. It all is in the way you do the introduction.