What does the clutch and brake fluid look like? Dip a white paper towel in the res's and see if it's dark. Old brake fluid will take away performance. When you buy a new to you car like this, you should replace the brake and clutch fluid, and the transmission and rear end also. Try that before doing the work! Top-tip: Redline trans fluid transforms your transmission shifting

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If you are going to do the clutch master, it's not so bad. It's held on to it's mount by two bolts with nuts on the back; the bottom one isn't easy to deal with; have patience. Be careful with the hard lines; if you cross thread them, they won't go into the new clutch master, and you will have to learn how to use a brake line flaring tool. New lines that need to be trimmed can be had at Autozone with the proper fittings, if this happens. Except for the hardline to hose fitting under the car; that needs to be re-used.
Keep us posted, and post some pictures of your new ride!