I have 3mm smooth/open and it is delicate, but it is not impossible to handle.
You just need to be careful and have some feeling for force you apply. Take a bit of conditioner, mix it with water, put it into the suit and shake well so all inside of the suit is wet. Then spill that from the suit onto yourself and spread. With proper movement, the suit will slide on/off without too much persuasion.
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