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I bought two ficus benjamina trees at a local home depot (Montreal,
Canada)) and put them into terracotta pots for my condo. One is in the
livingroom in the front of the balcony window where it gets a couple of
hours in the morning of sunlight and the rest of the day the curtains
are open but there is no direct sun. Unfortunately my condo unit is on
the northeast side of the building so the only light I get is in the
early morning. The other ficus is in my bedroom, which only receives
some bright sunlight in the later evening for a couple of hours since
it faces northwest.
Both trees have been dropping leaves like crazy for the past month. I
see leaves dropping everyday and I usually give the ficus a strong
shake which make many more leaves fall. I was told that the ficus would
do this to adjust to the move, but I'm getting worried now (it's going
on a month now of leaf drop), since the lower branches are now
practically bare and more leaves are dropping all the time. The trees
are both starting to look kinda sickly since all I'm seeing is more and
more twigs. There are several green pointy tips (buds?) on some of the
twigs at the top of the trees, but others are schriveling up and
turning dark brown. I am watering when the soil feels dry and afraid to
overwater them. The leaves that are falling naturally are yellowish and
some are completely dried up and brown, but when I shake the trunk
vigorously, there are green leaves that fally of very easily. I am
misting the trees every couple of days. I don't know where to go from
here and need some expert advice because I think I'm doing something
wrong.

Any help is appreciated.

I have moved my four 20-30 year old 8-10 ft ficus many times without
having leaves fall. One location is in a dark inside corner, two spots are
in east windows, and the fourth is in front of a south window. The only
difference seems to be growth rate, and they get rotated annually -- without
falling leaves.
( I heard the "falling leaves" thing was a bad rap, caused not by moving
but by new owners over-watering, or letting the soil get too dry, etc. I
have had heavy falling leaves a couple times very early in the 30 yrs, and I
am fairly certain it was soggy roots, cured by the shower. A few falling
leaves is usually dry roots)

If I had the problem you describe: check/fix the pot; fix the soil; kill the
bugs; and wash the plant

1) Always make sure the pot has a hole in it, so there isn't ever any
standing water inside the plant after watering. (I don't know what "soil"
yours are potted in now, but sometimes the mix is dry sterile black dirt
mixed with dry sterile perlite. You may need to get some decent potting soil
mixed in)
If I didn't like the soil, I would probably repot them. And I put some
pot shards around the hole, so it doesn't get plugged.

2) Then I would put them in the shower and give the leaves a thorough cool
water shower, at least long enough to flush the root area of the old water
(if you don't repot them).
Let them sit in the shower for a few hours to drain and then give them a
shake.

That ought to "clean up" the roots, if they have been sitting in water.

3) Then I would put some plant food spikes and some systemic in the pots
(and since they are new to the house and you got them from home depot, I
would put systemic in all my other plants as well)

4) when the soil seems almost dry in a few days, water sparingly - now,
sparingly means you don't want damp or soggy soil - but you don't want dry
soil either.
Too dry means the soil is all "dirt" and no organics, or it got so dry
since the last watering that water runs right through when you water it.
Too wet and the leaves fall off.
(Unless the soil is really dry, right now I would err on the side of
sparer watering. The roots need air to work and heal.)

Then water the same amount, on a regular basis.

fwiw...