Need IT assistance for miscellaneous computer tasks

I’m looking for a handy IT person to help with a few miscellaneous computer tasks around my home office. The main job is to troubleshoot some slow performance on my desktop, install essential software, and set up automatic backups. I’d also appreciate guidance on organizing files and improving security, plus a quick check of my home Wi-Fi signal. Please bring any necessary tools, and be prepared to explain steps in plain language. I’m flexible on timing but would prefer a morning slot and to wrap up by early afternoon. If you have experience with Windows and macOS, that would be ideal, and a brief estimate of potential costs would be great.