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Taiwan will have the same week long holiday as the mainland, officially starting on the 18th. The biggest days are the first two: the 18th is new year's eve and the 19th is the first day of the new year. Things will be very busy. People come home from afar to be with their families during the holiday, so the population density goes up significantly.
Whether it will be frustrating depends on you, but difficult is a real possibility. Here are some important things to know:
However, this is a wonderful time to experience the local culture. It simply does not get more festive than the lunar new year celebration. You will not be hurting for excellent things to see, do and eat.
Upvote:1
I have one piece of advice for you. If it's a time where huge numbers of people are out such as midnight on New Years's Eve, taxi drivers might not want go anywhere near the crowds. I'm talking about something like trying to get a taxi driver in New York to take you to the ball drop location when there are 1 million people out.
I never met a rude taxi driver there but at times like this they often leave their doors locked so you can't just jump in their cab. When you flag them down they will first ask where you are going. If it's a high crowd area they will not take you. They won't even let you in the car and they will drive off.
One such place is in Taipei anywhere around Taipei 101/Sun Yat-Sen Memorial Hall area. If your hotel is anywhere around there I'd recommend staying within walking distance during these times.