paint adhesion

In my house the wood has all been painted with a gloss lead paint. The doors, the skirting and the windows. I know I cant paint directly over the gloss and I dont want to sand it because of the dust and with it being lead paint. I have seen a few people recommend primers but wondered what...

Ok guys please help, I need an expert! Got some louvre doors from https://www.simplyshutters.co.uk/shop/interior-louvre-doors-white-line-painted-louvre-doors-p-89.html They came: "painted in white to save you the laborious task of having to prepare and prime the wood yourself..." - To be quite...