Help with a windshield washer pump on a 1990 Audi 80?

Was wondering if anyone has changed there washer pump, and if it's a big job, as I will be doing it outside in the cold. Any tips would be appreciated.
Thanks Tim

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.