That sounds great and pleased you have decided to go ahead.
As you don't have any occupants in the tank at the moment it should be easy to get the tank parameters right by doing the planned water changes and add very little of the GH/KH+ until you have done the last large water change on Tuesday, that way it is easier to add the GH/KH+ to the level you want directly into the tank then - easier than finding it is over and having to get it down?
IF you were thinking of getting the shrimps from ProShrimp, they have quite a variety, bear in mind that there is postage cost only to a certain value (I think it is £35) so it may be better value to order a few more shrimps instead of paying the postage - if that makes sense??? If you are having them delivered Prohrimp or ebay you need to be home to sign/receive them obviously and IF using ebay MAKE SURE the seller is sending 'Express Delivery (Royal Mail Special Delivery (TM) 1:00 pm)'!
Hopefully we will hear that everything has worked out well and all the hassle hasn't marred the experience.