Hello and welcome to BW forums
Sounds like you did great
If you are only just starting sleep training you can expect LO to get frustrated and to let you know about it, after all he has known another way of sleeping for 8 months and suddenly all change. There is also often some improvement seen over a few days and then a regression where things suddenly seem to get worse again, hang in there through that, support him more if he needs it but try to have faith that it is just a regression and things will come back again.
You can help your LO as much as you need to, there is no problem with being in the room or having a hand on him all the way to sleep if needed (which can be gradually weaned) but what you have described is fine.
Hope that helps