I preserve getting duties which might be above my talent degree. How can I deal with this with out coming accross as grossly incompetent?

I’m 6 months right into a model new job that makes use of a know-how I’ve had no experience in (nevertheless am attempting truly laborious to check). Often I get duties that I’ve precise downside with. I flag this: I say that I’ve on no account accomplished that sooner than and I’ll have downside. I get some help, nevertheless the method on a regular basis takes means longer than estimated and is completed pretty badly. This locations me beneath an unlimited amount of stress and is embarrassing as my duties often get rejected at QA.

I’m all for finding out nevertheless its merely an extreme quantity of. I have to grasp points incrementally, not abruptly. Or else do an accurate course on the subject.

How can I focus on to my boss about this with out wanting like I’m ineffective or backing away from challenges?