Zen cart upgrade

General information for the website: zen cart version upgrade from 1.3.9 to 1.5.3
Kind of development: Customization of existing website
Num. of web pages/modules: zen cart
Description of every page/module: i need the cart upgrading to version 1.5.3 from current version of 1.3.9. to migrate the current products (approx 70) and database (items/attributes/meta tags etc)
Description of requirements/features: zen cart version upgrade from 1.3.9 to 1.5.3
Specific technologies required: zen cart (PHP / mysql)
Extra notes: hi,

i have a zen cart store at;
www.sequinbikinis.com.
i need the cart upgrading to version 1.5.3 from current version of 1.3.9. to migrate the current products and database (items/attributes/meta tags etc).

its quite straightforward, i have a store template.
except the larger image scripting which i couldn't get to work last time i upgraded myself, had to get help.

if you can do this please give me a cost price and payment method (paypal?)

thank you.