ERPNext (Python) expert needed- Come Pros

Descriptions: 1. Email notification not working - it must be set so that whenever users comment in the tasks/projects, the comment will be emailed to the user 2. Notification (MORE IMPORTANT) - the default setting is set in a way that when the task is assigned to, all the users will get the notification. It is supposed to be only the user whose task is assigned to, not the rest of the users. 3. Data importing - all the tasks/projects and comments need to be imported from Insightly to ERPNext. I will provide the CSV files to do the mapping. 4. Notes - the notes cannot be edited once saved. It must be in this way: whenever a user posts a note, the user can edit/update and save it. Right now, only the Title cannot be edited but the contents can be edited and saved. 5. Lead Source - how to edit the sources? And how to add new sources to it?