It truly depends on the individual needs. If there is a trip ahead and you know that even some basic phrases will add to its success, then it would be very unreasonable to refrain from it simply because of the belief that "no, sorry, I haven't reached a B1/B2/C1 level sertificate in my previous foreign language yet, so no chances that I start a new language now!". Drive for accuracy and perfection in one's foreign language skills should not be too obsessive to paralyse one from further action!