I want to add electrical baseboard heaters to my second floor bathroom and attic bedroom. What type of electrical knowledge do I need to do this? Should I hire an electrician, or is this a DIY job? I have one empty wire on its own breaker running upstairs already, but am confused by what it takes to add a 220v or 240v heater. Thanks.

I am planning on setting up a woodworking shop in my garage. I plan on installing a sub panel in the garage to do the wiring to the outlets from there. There is 65ft from the main electrical box to the location where the sub panel will be. The types of tools that I will be using in the workshop are as follows. Table Saw - 24amps Belt Sander - 9amps Router - 12 amps planer - 15 amps jointer - 14 amps circular saw 13amps miter saw - 15 amps. All tools are running on 120 volts although the purchase of a new table saw may go to 220 at 12amps. At most I will probably only run 2 tools at one time maybe 3 depending on if I have help in my woodworking. I will leave all the lighting and the garage door opener on the current wiring. The question I have is what size wire should I run between the main panel and sub panel? Originally I was going to go with 4 gauge wire with a double 100amp breaker at the main box, not sure if the 100amp is too big of a circuit breaker for this wire. I felt that I probably did not need to run this much wire to the garage for the tools I am going to be using. I then thought I would run 6-gauge 600-volt wire with a double 60-amp circuit breaker. This would all go to either a 100amp or 70amp sub panel. Can anyone give me a recommendation? Hopefully I have given enough information.