adding oscommerce mods to a live site

we need to add the following mods : - special prices per customer - X-sell for sppc - Prices for only logged in customers - Multi product update for quick price update for sppc. - Hide products from customer groups for SPPC the site already has the following mods installed The previous contributions installed are : - admin access level 2.1 - CCGV 5.13 - Hide price if price is 0 - Page editor - Tiny mce - Event calendar - City delivery - Canadian separate tax - Main page categories please only post if you are serious and know what you are doing. this is the second time we post the project, we already wasted money and time with the first bidder,who won and didnt know how to do the job.