There should be no requirement to pay anything further to continue here in chat. I will try to provide an answer to the above based on what you have advised me so far however, without some further information from you as above, I am limited in what I can say on the matter but in the hope it is helpful nonetheless, I will provide you with the following broad answer. If you are able to kindly provide me with the above further information or if you have any further questions generally, I will be delighted to expand on the following - please just reply back to me in this case:
Notwithstanding the above, in general terms you need to review the requirements that you have been advised of carefully in order to ascertain precisely what is required of you. In general terms, an affidavit does not require the involvement of a solicitor to prepare unless you require assistance in drafting the specific affidavit itself. An affidavit does not as a rule, but may as a result of additional requirements made by the party that has requested the affidavit, need to be signed in front of the solicitor. If there is a requirement to sign the affidavit in front of the solicitor, usually, this can be arranged at short notice for a nominal fee.
Something more extensive as required, then it may be that a solicitor will need to be involved in order to prepare a statutory declaration or, depending upon the extent of requirements, it may be that you require a specialist solicitor known as a notary public.
In relation to powers of attorney, again, you may be able to prepare one yourself about the involvement of the solicitor though many would choose to instruct a solicitor in connection with the preparation of a power of attorney. If you wish to attend this yourself, and you believe it would satisfy the requirements that have been notified to you, you can find precedents for s10 and s25 powers of attorney through a simple Google search