Work on our Magento website 1.8.0.0 too fix shipping and tax issues

We are in UK online seller. This project is to fix the following issues on our magento ecommerce site. I am ready to award this project right now: This project is to fix these issues shipping charge for UK customers, we need two choices depending on size and weight depending what item they order. For few items we sell that is small and can go by by postal system for £4, but most items have to go by courier option, at £8. If customer buys small item, few small items few pieces he needs the shipping charge by post, but he can also choose courier option. if customer orders big item, he is forced only option is courier but for big item he can buy one piece with one piece shipping charge at courier £8 or several items still only one shipping charge at £8 The second issue is European customer and worldwide customer. When we sell to enduser outside of UK in Europe, they must pay our VAT.   If we sell to business in Europe (but not business in UK as if we sell to vat registered company in UK we must charge full vat) the EU customer must enter their VAT number Into magento site, and then they do not get charged the VAT by the magento system. When we sell to enduser outside of Europe, ie America or HK or Australia, any country outside of EU the system must not charge to them tax, regardless if they are end user or company. Now the final issues are the shipping charges for EU customers and shipping charges for outside of EU customers. The shipping charge varies depending on size and weight of what is ordered. If they order 1pc the shipping charge is one price, if they order 2pcs the shipping charge is higher. So we need to assign a shipping charge to each item if customer buys 1pc from inside Europe, and a different shipping price if customer in Australia, or HK or USA or any country outside of EU.  If the system can not handle this, maybe option is to change the system so if EU or Worldwide customer orders, they don't get final price but we get an email with ther order and we add international shipping and send to them revised invoice for them to check and pay. We spent a lot of money with this site but right now still we can not use it. This project is to resolve these issues and set it up so it is fully working. Our ecommerce site is [login to view URL] I am ready to award this project now, but don't type "I can do it" I want to read you understand all these points and tell me how you will fix these issues most online sellers face these exact same issues as they sell to local country and also to other country's and different tax issues so it must be common issue Please write back with full details, price, when you can start and timescale to implement. Thanks for your help, Simon