Using sqlite in multithreaded environment

Using sqlite in multithreaded environment

I've been trying to wrap my head around SQLite docs about multithreading,
but still not quite get it. Let say I have 2 threads that read and write
from/to DB. My write consists of multiple sql statements, so I need wrap
them in explicit transaction, something like this:
sqlite3_exec (myDb, "BEGIN TRANSACTION", 0, 0, 0);
// write stuff here
sqlite3_exec (myDb, "COMMIT TRANSACTION", 0, 0, 0);
First question: do I need wrap read operations in transaction the main
requirement for me that until write transaction finishes it should not be
possible to read half written data
Second: can I use one database connection in both threads? - looks like I
can't because if both threads are writing to DB and therefore both open
transactions second "BEGIN TRANSACTION" statement will fail.
So what is right approach here: Use own locking mechanism? Use one
connection per thread? - what will happen in that case, should I worry
about SQL_BUSY/SQL_LOCKED?
Thanks!