Why you can't wait until your court date to take action? -- how to save your driver's license
If you wait until your court date to take action, it may be too late. You could lose your license -- even before you go to court. You must either demand an "administrative suspension hearing" or a "refusal hearing," depending on whether or not you submitted to a police blood or breath test, or refused to do so. Either way, the time limit is ten days. If you don't demand a hearing, you'll lose your license, regardless of what happens in court. This isn't part of the court case, so you can't wait until you go to court to take care of it. You need to act promptly.
Can they take my driver's license even before I go to court?
They can try. You received from the police a "Notice of Intent to Suspend," if you submitted to a police breath or blood test, or a "Notice of Intent to Revoke," if you refused one. (Often, police officers tell people these documents are a "temporary driver's license," which only describes part of their function.) Either way, if you don't demand a hearing by filing the correct demand paper in the correct place and do it within ten days after you get that notice, you can lose your license -- even if you plead not guilty in court. The administrative suspension and refusal revocation provisions of Wisconsin law operate independently of the drunk driving prosecution. So, pleading not guilty isn't a substitute for demanding the hearing within ten days. You need to do both: demand the hearing and plead not guilty.