Yes, Insta-Portfolio can be added to your existing Wordpress website and it will not cause conflict with your existing links. Please do note that Insta-Portfolio will not work if you add them through the 'Add Pages' function of Wordpress. Insta-Portfolio requires you to upload via FTP to make it work.
To upload Insta-Portfolio to your website, locate the root directory in your ftp client and upload the whole Insta-Portfolio folder there. We recommend that you ask your hosting provider for this info if you are not sure.
After a successful upload, you can now link to your portfolio page (ie. http://www.yousite.com/myportfolio4) in any of your Wordpress pages or menus.
Additionally if you do not want to do it yourself you can hire an outsourcer to do it for you. There are a lot of cheap outsourcers that can do the task for you. Here are some of the sites where you can find them: Fiverr, oDesk, Elance, onlinejobs.ph etc.