there is a great website where your questions can be answered, The Tape Project Forum. here is a link;
http://www.tapeproject.com/smf/index.phpon that page there is a great primer on reel to reel tape recorder basics you can read
hereregarding finding a tape recorder tech; there are a few around. where do you live? also; how serious are you about getting the top level of performance?
shipping a RTR deck and having work done is a pain and expensive. you might want to investigate whether the Teac is the deck which will give you the performance you want after the trouble and expense you will go thru. you will likely find that the in initial cost of the deck will be mimimal compared to the other costs.
get the right RTR deck for where you want to be; the Teac may be the right one after you do the research. The Tape Project Forum should be a great resource for that.
good luck. i have found RTR performance to be above any other.