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It really goes case by case. Some single stars are so massive and large that its very easy to determine its mass. Same goes for single stars of far less mass in our neck of the woods in our galaxy(within 300 light years) While determining the mass of multiple star systems get tricky, while its easy to determine the mass of nearby binary star systems such as Alpha Centauri system and the Cappella System. but sometimes its very tricky when the primary star in a system is many times larger then their counterparts. for example we know that Polaris (North Star) has 2 smaller companions and we even have rough estimates of their orbits. but since Polaris A is so large and massive its hard to tell the mass of its smaller compatriots.

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