This is not what you want to hear, but the best mechanic will be yourself, even when considering the learning curve. The base Sky without the turbo is fairly easy to maintain, and the turbo is not that much harder. The most important matter is how to avoid breaking things on what is now a 16 year old vehicle with plastics that are now potentially brittle.
If you decide to take on this achievable challenge, this forum will be your best resource. The investment in simple tools will payback their expense after their first use. One really big "plus" will be having a garage to work in and to store your tools.
I encourage you to consider this.