To me, it depends a bit on the time of year you're flying.
As long as both flights are on the same ticket, the airline is obligated to get you to
your final destination. If you miss the connection due to delays on the outbound,
they will get you on the next available flight. Plus, as long as the delay is not due
to weather or issues outside of the airline's control, you may qualify for EC261 compensation.
But, if your flight is in the middle of the summer, for example, and you miss the
connection, it could be a while until they can get you on another flight if the
flights are all fully booked. However, in winter, and on a weekday, the flights are
not as likely to be booked up.
Warsaw is not that large an airport, so the question is whether your inbound is on
time (or early), and what the line is at immigration. Neither of these can be known
until the day of arrival, so you'll have to decide on the basis of the smaller amount
of information you have now.
Also, if your travel date is far out in the future (say, January), there is a non-trivial
chance the airline will change the schedule themselves and rebook you. Which
then gives you a chance to change to what you want, if the airline didn't get it
right, for free.