You want to hire a freelancer. Why? Because, apparently, you have got a problem to be solved. There may be different situations: you own a small company, start-up business, home business, you are a bit tight on a budget, or (and) it's just one time project so you don't need an in-house specialist.
So naturally you would resort to outsourcing and hiring freelancers. The basic intent would be to get stuff done and save some bucks, either because you are stressed with resources or have a scarcity mindset. The latter is much worse.
Alternatively you would hire a freelancer (or freelancers team) because somehow you came across his or her portfolio, post in social networks, or even get to know about him/her by word of mouth. To cut long story short you have that initial interest and trust to work with a freelancer.
But how safe is it to hire a freelancer? Will it be good quality work? What are guarantees and risks? What are the wins except the possibility to save time and money?
Well, let's refute popular myth that freelancers are inexpensive. In fact a good professional, be it freelancer or in-house specialist, would value his/her time, skills, experience and won't let to downrate. There are a lot of freelancers (it's even more correct to say entrepreneurs or self-employed specialists) who charge, I would say, more than heavily. And what is surprising is that employers give these money easily. Why? Because they trust a professional and value their time more than money.
How can employers trust a person? Most possibly they worked together before, have positive previous experience working with other freelancers, their friends or colleagues worked with and advised a freelancer, freelancer has a substantial portfolio, solid website, presence in social media, communicate on a proper professional level and show expertise in their field. It feels that you are working with professional.
Freelancers are well-motivated
So following our topic, imagine a person who committed to quit a day job, neglect social package, social conventions - it's a good deal of courage and well thought strategy. A person who works all day on his/her own, being an own boss is a display of self discipline, motivation, goal-orientedness. Usually people who decide to quit a job and become freelancers, entrepreneurs are quite reasonable, hardworking, determined, long run thinking people. Those people are very demanding to both themselves and others, they would scrutinize the project they are working on and deliver the best result.
Your check list
So, if you want to work with a freelancer but are not sure if you can trust a person:
check up freelancer's website portfolio, blog, social networks accounts, etc: it's easy, there you will find the best samples of the work, feedbacks, a freelancer's communication with visitors and clients
send a message and wait for a response: depending on how quick a freelancer will respond and how professional he/she will communicate, you can tell if a person worth trusting, and if you want to work together
remember that in most cases a client can leave a negative review via numerous social media, so normally freelancers are quite vulnerable creatures, and normally freelancers will do a good work to have a good freelance internet karma ;)
In most cases you can easily tell if a freelancer can be trusted. Just visit a freelancer at his/her 'working place'. Check up his/her website, blog, social networks 'working' accounts, webmarkets, in a word internet space. Freelancers don't want a negative feedback, contrary they want to build up their brand, they want happy clients, work nicely done, plus to their freelancer karma, to pay their bills, to feel self realisation and completion after a project is finished, be motivated to grow, to take on new projects. I'm not saying that in-house workers are less productive, it all depends, but when you are working for yourself, when you are your own boss, you are really motivated to deliver a good result.
Hope it helped. Don't hesitate to ask me questions, I would be happy to help. Maybe you need services from highly motivated, ultimately skillful, and experienced logo designer?