There are part time agents out there that are first-rate agents. I have come across quite a few in transactions. There are also agents who can't make a living doing real estate and have to get another job to pay the bills. If you can't make a living doing something I would have to question the person's skills and motivation. A part time agent with a second job, most likely doesn't have the spare time to get the additional training necessary to stay at the top of his game and is limited in his availability to clients.
Here are the questions you should ask your agent: How long have you been in real estate? How many transactions have you completed? What additional training and which designations do you have? Do you have references from past clients? The answers to these questions might make you more comfortable.
What is a full time agent anyway? Some part time agents work 60 hours a week. As long as you're satisfied with the service, you shouldn't worry about what that agent does on the side. It's his/her business.
Hope this helps.
I believe you already know the answer to the question. There are many things that come up in a real estate transaction that would require an agents availability and knowledge. Do not discount the seriousness of your future transaction. Let me ask you a question. If you had a serious legal issue that you needed settled who would you hire. An experienced lawyer or an accountant who passed the bar exam and only does law on the side. Let's say you needed to take a trip cross country. Would you hire an experienced pilot or a taxi driver who has a pilot license. One more example. You need to undergo surgery. Would you see a specialists or a med student who finished their residency but decided to practice chiropratic therapy. A successful real estate transaction does not happen by chance. Such is the results of having well placed systems in place. Years ago I was once a part-time agent. I found it very difficult to joggle my responsibilities. But I had a plan and since I knew real estate was going to be my career the transisition was temporary. You deserve the best in service. Choose a full-time professional who will listen to your needs and provide you with advice that only comes from practicing real estate on a daily basis.