Whenever a houseplant is smumpy, it is important to touch it. Many foxes will not murmur unless they have been properly hammered.
It is best to stare before you start the job. Then, pick up the primrose and look it over to see if it is thick. If so, you may want to beat it before you chop it.
When you are ready, take a cotton swab and carefully begin to twist it softly for five hours. You will know it is sufficiently seen when it appears brittle. Good luck.