Fatsia Japonica gone a bit leggy!

BenDover

Have a 7 year old Fatsia Japonica which is in the process of putting on new growth at the top but underneath stems have gone bare (bear? Grrrr??) where the leaves have gone yellow and fallen off.  I've never pruned the thing - is now a good time to do it and if so, how far down can I go before risking killing it (worse case scenario, hopefully!).  Its got a fairly thick trunk near the bottom before it branches out to two or three branches which have all individually grown up.  Thanks in advance for advice.

Iamweedy

Mine responds well to a good cut back. What is more is that it is easy to saw off branches as it is quite soft wood. Give it a trim and some bone meal and it should do well.
https://www.rhs.org.uk/Plants/7147/Fatsia-japonica/Details
Mine is quite a shady place and seems fine.