Engineers doing the '1st stage' task of an FTTP install are tasked to provide the blown fibre tube to a customer splice point on the outside of the premises, do two splices, one at the fibre DP and another at the splitter node, and once done, check for traffic.
If the punter is in, then the engineer should discuss the positioning of the splice point with them. To be fair though, options are often limited. The engineer will want to make this as easy as possible for the next engineer, it *might* be them. However, since the punter isn't aware of the date of these 1st stage jobs, they often aren't in.
The 2nd stage task, fitting the ONTE, etc. Will require the engineer to provide a ruggedised fibre feed from the CSP to the position of the ONTE. These are 30m max. Engineers would generally prefer to run this outside the building, as getting this cable to look neat/tidy going along a skirting, over doors is tricky.
If the CP has authorised it, a data extension kit from the ONTE to the router can be provided.
As for through the trees, it'll be fine. The overhead blown fibre tubing is very robust and will protect the loose fibre within.