Brand recognition in US, which can be important to newbies, continues to be a challenge. Expenses can be high (E&O, appointments, limited free marketing materials, purchase your own computer & stationary, LPL fees, etc). Training was REQUIRED in my branch even if you don't need it, until you hit certain production numbers.
Joint work is great training, but check out your work partner on FINRA broker check. I didn't and lost a big client (1m aum) because my "expert" joint work partner had a client complaint and I didn't know about it.
Need a STRONG natural market to approach or lack of filters. Orphan clients have been recycled many many times.