Capsule CRM Import & Customization

Currently I have a Sugar CRM database which I am looking to export all data to Capsule CRM. I have all contacts and accounts on 2 seperate excel files, with notes history and tasks on another 2 excel files. All are tagged with unique ID's to marry up the info when importing into capsule. Several fields we currently have can be deleted as we do not use them and there will be some new fields will need to be cusotmised. import activity notes and tasks from an excel file into Capsule CRM via their API is what I am told I am looking for. Ideally I would like this work completed by Monday 4pm UK time if possible. Can anyone help? Raj