Agree with HM, AI is easy IF you get the dates right. we have had some good success with it, but get someone experienced to show you how, or there are some good websites that explain it (someone will post here I'm sure)
Otherwise boar hire is also a good option. Normally your gilt/sow will visit the boar, stay with him for two cycles to make sure and then come back. You normally pay for this service.
Some people will lend you boars if theirs aren't needed. This may (not will, but may) mean that you have him for some time, as the owner is on no hurry to collect as you are feeding his stock, so ensure you have a clear agreement as to when it is going back !