Squarespace to WordPress Site Migration

I'm looking to transfer my Squarespace site over to WordPress for the main reason of wanting more customization options and versatility. It is paramount to maintain the original design of the current website during the transition; I value consistency and don't seek a redesign. The key additional feature I'm interested in incorporating post-transfer is a membership area. So, proficiency in WordPress and experience with membership plugins would be ideal. Squarespace does not allow for customization of the member area. I like my entire design of my website so I need an EXPERT in creating member areas or a portal on Wordpress.

Skills Needed:
- Excellent understanding of both WordPress and Squarespace
- Familiarity with the transfer process between platforms
- Ability to implement a membership area within the WordPress environment

Expectations:
- Maintain site design during transition
- Implement a new membership function
- Smooth, issue-free transfer with minimal downtime