It is true that LVNs/LPNs don't have the same amount of paperwork as the RNs do, as they do not do admissions, follow-ups. discharges, etc. and thus are spared all that tedious OASIS documentation.
Our LVN/LPNs do pretty much the same cases as the our RNs... there are very few cases where they might prefer to put an RN that I can think of.
And certainly if there's something you might not be familiar or comfortable with yet concerning your skills, it is best to let your supervisor know before you accept that visit. Most HH agencies do ask what skills you have performed and which you have not, which you need brushing up on, etc. And then they will schedule you accordingly.
Hope that helped.